Houston... damn fast where you can find it. My personal best so far is 31535kb/s down 12002kbps up with 49ms ping off of Almeda and 610 near the medical center. I am impressed so far, they just need it on more towers. Seems like they only have 1 in every 3 upgraded max.
s4gru is a great place for updates on LTE, if you have sprint and are on XDA I would be surprised if you are not also registered there.
*edit* just noticed all the LTE threads in general, I was wondering why a sticky for LTE! Now I see... people must be excited.