Already subbed to it and don't regret it a single bit.
However, I realize it's very special interest and niche. I happen to like what's on the channel and have been lusting for it for over a year. As soon as it became available, I ordered it. For those that aren't into football, rugby, Aussie Rules and Gaelic Games, I can see why they wouldn't want to order it.
One thing is for certain though. After watching the opening weekend of gridiron, every team in the NFL ought to sub to Setanta so they can watch the Rugby World Cup and learn how to tackle properly.