No regret at all...got it for $450 total from Dell.com and find it as a very very smart computer in your pocket which a phone as well...
For a full joy of experience by all means; all you need is an extra battery if you're off to the place where no electrical outlets or just carry the charger always with you...neither is a big deal nor a concern at any point...
I believe I cannot decide now since more innovative applications will be published and more surprises will be in the future . It's the same feeling when exploring N810 one year ago . I am really happy with my N910 now .
Overall, nice device. Seem to learn something new every day about its capabilities, and am very glad there is so much activity re: new applications/programs. Though, I do hope maemo 6 works on the N900, that maps come along for free, and that Nokia shows full support for the device for a long time to come.
I bought it like first week when it came to my country, I spent 500 Euros for it... and I dont regret it at all.
It is great and simple phone, it replaced my PC for surfing and skype calls, it replaced my old mp3 player which had 4GB memory, it replaced my old "cd player" in car with MF transmitter...and that is just some stuff that I am using it for. So if I wanted to buy all that stuff I would spend much more money...