From my experience the technology (802.16e) is showing remarkable promise.
I'm 10.7Km from the BS with NLOS (zero, nada, nothing) and when participating in sector saturation testing I've gotten 7 Mbps down & 1.5 Mbps up (obviously on unlimited profile). Am cheating a bit, have 1m grid antenna attached to CPE.
Its amazing to watch S-OFDMA (that which set 802.16e apart from all other current radio technology) in action. As soon as the the CPE/BS arent able to maintain the highest modulation (QAM64 3/4), they start sub-channeling. I sometimes land up with 16 x QPSK/QAM16 communication channels running in parallel to maintain throughput. Its like wireless torrenting.