I've had my i560 for a full year now; it replaced a perfectly good but just-too-large i55sr.
The i560 is the best-looking phone Nextel has put out recently, maybe the best-looing Nextel phone ever. The black version really has a lot of styling cues that are reminiscent of Batman, hence I call it "the batphone". Downloaded the Batman themesong as the deafult ringtone, and EVERYBODY loves both the phone's looks and that ringtone. My co-workers with Verizon phones are jealous of the cool Batman styling (although Verizon does have better network coverage...)
The i560 is a nice size, fairly compact with the standard battery, and not so small it's difficult to use with large hands. Rubber grip is great and beats hell out of those slick plastic phones other carriers foist on the public. Even with the rubber coating and the grooves for good finger grip, I've dropped my i560 onto concrete a few times but not even a scratch.
It's nice to have the option to buy the extended battery door; I switch between the thin (stock)battery with standard battery door and the big battery from my old i55sr with the extended battery door in place, depending on how much I expect to use the phone that day. As with all Moto's battery life is poor, so the bigger battery option is a good option if you use your phone a lot.
Reception is average for Moto/Nextel. Speakerphone is pretty good with the phone flipped open but only fair with the phone flipped closed.
The GPS location function built in is amazingly accurate. Depending on local conditions and proximity to clear line of sight to satellites it takes anywhere from 30 sec to 2 min to get a position, but usually it is within 5 meters accuracy, much better than the GPS location accuracy on my car and another co-worker's car (both different makes).
I really like the Profiles on this phone; I have one for day and another for nights. The night profile I have set to allow through only calls from 5 key family members; all others are routed to voicemail without ringing the phone. In the morning I put it back into standard profile that lets all calls through.
Overall I really like my i560 and would buy another one if available when this one wears out (although if it's like my old i55sr it will never wear out). It's a good, solid, basic phone with true GPS, good performance, and great looks (in black anyway).