The best way to describe the N900 in my opinion, is what has been said on here many times. It is a mobile Linux computer with a built in cellular modem. A computer that can handle some functions of a phone, not the other way around.

MMS support? wonky at best (although Havoc mode works fine for me) tons of or the latest/greatest apps? No way. Lots of games? Nope.

But...

Full blown Linux environment/console? Yes. Fully featured builds of common Linux tools & networking utilities? absolutely! (nmap, tcpdump, aircrack-ng, nc, perl, python, vim, etc... Good solid UI? IMO, Yes.

Even as a Linux user and network programmer I admit I don't use anywhere near the capability of my N900, but I still think it is a solid device. Only close device right now is the MyTouch, which has a hardware keyboard.