Ok2 has been really good. Very little buffer. I tried Fab last week and there was a lot of buffer there. Great HD quality but found a lot of buffer around plenty of channels. Specifically Showtime, which is a must have for boxing for me. Just wanted to give my 2 cents after trying out OK2.
Edit... Sorry guys, I bought a month of service not a trial.
Would you like to try out WickedTV to compare the service?