Well, I have had mine for 2 months now, so not quite a "first impression". I bought mine at a local store.
- Bought it for the screen, and my historic good experience with Nokia.
- I originally was looking to buy a combo cell phone / pda / wifi device, but US phone companies just don't want to sell a 9300i or 9500 in the US, so I ended up with a low end Nokia phone and a 770.
- I think this was generally a good decision

- It has very solid WiFi reception, better than my laptop card
- Browser is pretty good - no complaints
- email client is mediocre. It just mixed together the incoming emails from 2 IMAP email adr.
- I am sorry to say that the "contacts" area is a joke. I can only guess that this area is there as a google talk adv.

- I tried dejapim for a short while, but the only way to move contacts from ACT to it was to first move then through outlook. Not an outlook user, so this was not really interesting.
- Loaded the GPL PIM (version 0.55 I think) Not really had a chance to test it yet.

I originally thought that the 770 ran Opera for many functions (not just browsing) so I loaded Opera 9 on my XP laptop. Boy do I wish it really did. I am now using Opera for browsing and email.

I still need to add a larger mem card.

Not an expert, but I think it is a bit slow, and given that the RAM cannot be field expanded, it would be a low cost item to add enough for it to run larger apps, like a full version of Opera.