They don't seem to run much, so I don't/wouldn't mess with them, because I think you get stuck in them because you can't convert it to cash and have to play it all the way through, and again, they don't run, except maybe at the low limits.
I'd suggest the bounty SNG's if you want to play sng's. They seem to be pretty good. Sometimes GREAT. Infrequently not so soft, but it's a rarity.
The 45 mans are good too, but late the structure is really bad so you'll have to get lucky.