I looked at some of the rings with levels built in but I just don't think I could trust them that much.
Ill just use the tube mounted levels. Pretty simple and jsut easy. If its wrong its probably my fault and ill take that because I can control it.
I do see the possible benefit of the ring mounted levels on a hunting rifle as they are out of the way from getting caught on things etc. But there is a chance for issues with about everything.