Here's my impression after using for good couple of weeks. I apologize in advance if i'm being a little bias on my phone. But again, I think i'm a lot less bias than the other techncial reviews out there online who does not use Linux based products in their day to day life.

Overall:
I LOVE my phone, really responsive, space is almost endless (wait until another phone with this kind of capacity...).

The good:
I don't want to put too much word to discribe this part. Afterall, I don't want to be a typical ***** kissing user of the device.
The maemo 5 OS: Being a everyday linux user, and you give me a phone with full linux support and environment to fuss around, i'm game.

Speed: LIGHTENING Fast! that's while i'm play EightyOne (Sudoku clone), playing music, and also doing texting like 5 people.

memory size: It feels like i can download the universe (in a mobile perspective) into this phone. With a 16GB ext card, this phone can store more data than a couple old computers i have at home already.

Hardware architecture: one word to describe will be AWESOME. the OpenGL ES make this phone that much stronger in the GUI display. And a couple games of Quake3 while waiting for people make this phone worth while already

Software Support: Although alot of people on the web is critizing how the app system does not compare to the fruity phone or the robot phone system. What I would say to those critics are A) You don't know where to get the good stuff and B)You are paying too much. Yes, I got to admit there's less apps.. but we are not talking about USEFUL apps. Who cares if my phone doesn't give me a fake lighter which I can play with?

Music format support: Having OSS support and FLAC support on my phone, I can listen to lossless music on my phone, and it's DRM Free as well.

Device space availbity: The phone's space is easily accessible as a massive storage drive. I don't need to download any I am so hippy Music player to sync stuff on my phone.



The bad:
Keyboard - I do not mind the keyboard keys itself, but as a hacker and a guy that lives in the terminal world, there's things that is lacking on the keyboard.
Here's some of the keys that is really useful that is missing on the keyboard: ~ | ` < >.
I can't even do proper debugging in the terminal because of this, the way to fix this is either use the bluetooth keyboard patch or ssh into the phone with a full environment, which is still a pain in the butt.

FM Transmitter - This is a well known issue, I think we can almost dismiss this feature altogether. I was really excited that I got it working like the UI developer demo on youtube (http://www.youtube.com/watch?v=n99S8iMYKRY) The catch here is that it only works the way the UI developer had shown, which is place on the speedometer, when car is idle. It doesn't even get the channel once I start my engine!

OpenSSH server - the ssh works fine when I am trying to ssh in as localhost (no duh!). When I try to ssh in from any full computers, it works but sometime the server is not responsive, it just stuck in some lala land for no reason. This delay may sometime be more than a 5 minutes or so! I don't think this is a phone specific thing but it's worth mentioning I guess.

No voice recognition phone book - Living in a suburban area around Toronto, driving is like a manditory thing. Also with the new cellphone laws in Ontario, it's a pain in the butt to call someone with this phone while driving. Not to mention if you put lock code on the phone, to call someone will take like a good minimum 10-15 seconds total. That's if you have the number memorized by heart. I hope some 3rd party addon will be available later on this.

Other "Undocumented features" worth mentioning:
Headset/Headphone system: It's a hit and miss with this one. If you have a physical headphone for music listening on, and also a bluetooth headset for phone, it's virtually impossible to distingish which is which for the media player. On the other hand, the sound quality of whoever call you is that much nicer because again, you are listening to it with a really nice headset which is meant for music...

Battery life: much less than the n810 for sure. But again, system is just like a millionth time more sophisticated, shorter life is expected. I got a spare battery and that just fixes this problem right away.