If it does well on cable,I am sure the others will pick it up as well...
Personally I tried it briefly last week , if it's the same thing and found that I could not keep up with the race, I had it on the 60" XBR with a great picture and found trying do the computer and the TV was very distracting.
The cable company here had it the first year, 3 or 4 years ago, and dropped it before the second year. I never really got into it. Only nice thing was that you could see if a caution happened during a commercial break.
Now...if they only added a regular commercial-free broadcast channel as part of the PPV, that might make it worth it.