i just wanted to chime in with my experience w/ the H900 so far.
background info: TivoHD, XBox360, Monoprice 5x1 HDMI switch all in a closet about 25ft behind the sofa, which is in front of the TV, all controlled with RF. TV is controlled via IR directly from the remote.
when i first setup the ir blaster in the closet, the remote would lag when sending RF signals and i would get the red-x about half the time. its very frustrating. i updated the firmware in the remote and blaster, and no improvement. i moved the blaster around in the closet - no improvement. i had to raise the 900 into the air in order to get it to work sometimes. so i started to research other rf remotes and possibly hardwiring an IR repeater.
well, after coming home from best buy after purchasing an H1100 and RF receiver to just experiment with (but not opened yet), i thought i'd try raising the IR blaster high off the ground (to about 7ft off the ground) and to my surprise, the remote started working perfectly for me. the range for me now is ~40' through a wall. i really liked this remote and did not want to return it... now i'm thoroughly happy with it.