I experimented with both channels yesterday, mostly before the 2nd Fox game - Chargers/Cowboys.
I generally liked the concept and I can see this can be very usefull as the season progresses.
I noticed this morning that that both channels were gone from the guide but I guess that is normal. I expect they will be active for Sundays games.
Oh yeah, the 30 minute "Short Cuts" is cool too. I watched about 10 minutes this morning. Easy way to catch up on the games I couldn't see live.