Remember that other handhelds have worse flaws so this is only information. Still, I haven't found the perfect one... Sometimes the price just scare me away.

Flaws my m100 had:
When I reset, the NotePad button always set itself to default so it's annoying to go to preferences and change it. Also it resets when I change batteries.
When I delete an ebook, the other ebooks tbat I didn't touch are also deleted.
To hotsync with the computer is too slow. For only 2mb, it can take up to 10 min!
3rd party programs crash often enough so I don't install those that are unstable.
I live in Canada and I can't find cool accessories for it.
I went half way around the globe and I couldn't backup my stuff so I didn't really use it.
The buttons can be accidently pushed with a soft case.

The flaws my m125 has:
You have to find the programs that move, share, use the memory card. The permanent program that's included is slow if you install too many things. I don't even own a credit card yet so I'm stuck with annoying programs.
The extra program added was Card Info and the only things you can do is format and rename.
I had to manage a way to get the most ebooks on my SD card(I just found out that there's a button on windows install tool that can change where this and this go), but I can't delete pdb's if installed directly onto the card unless a pda-reader can.
The SD/MMC card can be easily removed so I fear to lose it since there's no cover. Also I have two cards and one has 29.1mb and the other 30.5mb... I wanted 32mb!
The screen protector doesn't help since it's like putting a transparent piece of paper over it and my books are tough to read. The protector is only needed for the writing zone so just cut it and my m100's screen isn't that bad and the scratches doesn't bother me as long I can't see it. If you rub it long enough, it will be clearer. With the sticker, it's less sensitive so beware!
It's slightly thicker and heavier, but you can't change the batteries in the m50x series so this one is good with backups.
It's too hard to select stuff on the screen when you have the screen protector and I didn't have any problem with my m100 that only has scoth tape in the writing area. The paper-like scoth tape is best for paper-like feeling and speed.
The SD/MMC cards are twice as expensive compared to compact flash or smartmedia so my budget limits itself to a tiny 32mb.
It would be great if it was using smartmedia instead or maybe compact flash type II for the 1gb microdrive! That'll be sweet. SWEET!

What you look for in the palm m125:
expansion
8mb
33mhz
affordable
if you can't stand colors screens for their lack of quality
monochrome screen for information, no bright colors to distract you

Well compared to other handhelds, the Palm company offers people a simpler operating system with better(and in large quantity!) 3rd party programs so even if it doesn't offer as much as other companies, it offers what people need(maybe best for 3rd party stuff). An Mp3 player would be great but we can't all afford 256mb cards and they drain the batteries faster, voice recorders have weaker quality on handhelds and my PPC(cassiopeia e-10) takes up 16k/sec at best quality, color screen just drains the batteries faster(the price scares me the most), and paying for low-class games isn't worth it compared to gameboys. Just don't buy something because it offers more, see if it's worth the price and it fits your needs. Pocket Pc's are more complex so it takes much much more time to get used to. You can't really compare PPC's with palms, so know what you need!

Let the buyer beware (Rating: 3.00)
Review : When Palm's products work, which in all fairness is most of the time, they're great. But pity the poor fool who needs to call customer support - a $25 fee to answer a question? absurd!
I have to give them some credit, when they could not fix my problem over the phone, they did refund the $25 and offered me a 20% discount on an upgraded model - I declined. Take some friendly advise and read what people who've bought Palm (or Sony or Handspring) products have to say in their reviews. Since my Palm crashed about a month ago I've been reseaching what to replace it with- the jury's still as all products seem to get mixed reviews. It's too bad, I really miss my little handheld but I may just stick with my Dell laptop. Good luck.

Great features - Short Life (Rating: 3.00)
Review : Until yesterday when my M125 died for no apparent reason, I was happy with my m125. It was small and relatively light, and was comfortable to hold. It was a replacement for my old Palm III (Which the new owner tells me is still working) so learning Graffiti was not a problem. Call me crazy but I expect the product to last more than 17 Months. Yes it was bought new, not a refurb. The SD card was nice to hold large documents.

If you do get this model, make sure you do a hotsync before you change the batteries. If you fumble with a battery for a second, the changeout will take too long and you will have to restore from backup. I average 1 set of AAAs a month, so I have no complaints about battery life.

With the service fee being $100, it was not worth repairing beyond the online try this first FAQ on the palmone site.

Usability 4.5 Stars
Long life 1 Star
Overall 3 Stars

Amazing technology but... (Rating: 4.00)
Review : The Palm 125 works great and is an amazing piece of technology. So user friendly! I recommend it.

However:

1) I first bought a M105 that was defective out of the box.(touch screen) Thankfully Amazon took it back.
2) The stylus on the M125 is a step backward in design. It is harder to get out than on the M105 and a true annoyance when my Palm is in the Hangdglove case.
3) The batteries are being used-up at a much higher rate than the literature suggested. (I do, however use the backlit screen a lot but this is because of #4)
4) The normal screen is often hard to read in low light. There are often low light situations where neither the regular screen nor the backlit screen are highly readable.
5) There are very few titles for the plug-in cards even though the M500 series Palms have been around for some time. (the cards are compatible.)

Despite these things, I am very glad I bought it and have been using it so much that it annoys my family!