Let the hive mind of Engadget get that for you.
"I'm in the market for a new phone and money isn't a limitation. I'm also not partial to any particular US carrier, but here are some of the features I'd like to have: WiFi, GPS, good coverage in lots of places, push Gmail (a must!), physical keyboard (a must!), a touchscreen, decent battery life and a relatively slim body. And please, nothing that has a fruit logo on it. No offense to the fruit fans, though. Thanks!"
T-Mobile USA has good coverage in the major cities, so if that's where you expect to be, this modem should serve you well. Also consider the lightly-loaded T-Mobile USA's HSPA network (at least so far), which should ensure very high performance for the early adopter. T-Mobile USA likely has coverage maps on its web site, so you can check there before you buy. My suspicion is also that T-Mobile USA's pricing will compare favorably with that of Sprint, AT&T and Verizon Wireless. The bigger question is whether any of these four traditional will be able to compete -- at any price -- against Clearwire's WiMax network. Clearwire offers service in approximately 50 markets today with some 460,000 customers, and the performance of its network is vastly superior to any EV-DO or HSPA network. Download and upload speeds are higher, latency is much lower, network capacity is vastly greater, and the price is lower. If you have had a chance to test it, you will know why this feels a lot more like a cable modem or DSL, than these "3G" networks.