Features:
+ Windows Mobile 5 OS
+ Abundance of software
+ Slot for miniSD
+ Wireless, Bluetooth, Infrared
- Pitiful onboard memory
- Unconventional headphone jack
- Poor camera function
Aesthetics:
+ Good looking
+ Just the right size
- Smudges easily
Usage:
+ Easy to use
+ Comfortable battery life based on average use
- OS hangs once in a while
- Echo heard while making calls
- Answering calls slightly long
- Problematic messaging software
- Camera mode takes a long time to load
Summary
The O2 Atom is fairly standard in terms of the various bells and whistles provided.
I personally like the size and form factor of the device, about the same as a common handphone and not too big like other PDAs. For the other not so good points listed above, well, if you like the device, then you will have to bear with it.