No.
Too many things wrong with this.
First, T-Mob's pretty crappy 3G network. Second, the open-ness of it means that it's very daunting to get new apps and whatnot through the store. It looks like a cluster-fuck. The phone doesn't have a standard 3.5mm headphone jack. The touch-screen isn't multi-touch, and it looks cheap. It doesn't have exchange support, and only supports push G Mail. No way to be an iPhone killer.