Ya, I have DirecTV and had the ticket last year for free. It is really awesome, but I honestly didn't use it as much as I thought I would because the Eagles were actually on regular TV so much. The thing that sucks is that there are 2 packages, one for 199 where you don't get the redzone/gametime channel and a 300 dollar one where you do.
Honestly, I was on the redzone channel 75% of the time so it is really lame they pinch you like that since it is what most people probably want. Two years ago I had AT&T UVERSE and overall it wasn't as good as DirecTV (nothing is tbh), but you could get the Redzone as part of a package for an extra 5 bucks a month and I wish DTV did something like that...but they want to sell it with their entire package.
Long story short, I would see if your cable provider offers the Redzone channel first to save yourself some money. I am not really sure how the service on PS3 compares to DTV, but I can't imagine it being as good as it is going over the net. Are you buying it to watch a specific team?