I assume you mean Reverberating Stance. It is dramatically better than spell turning. I don't know whether that's good or bad. I mean, on the one hand, it pretty much gives the one-finger salute to a lot of offensive magic and heavily nerfs archers and throwers. On the other hand, it's one of very few stances that you'll ever get and assuming the stance carries the opportunity cost of not taking any other stance. Plus, it's likely to eat most of your swift actions, which limits the opportunity to use boosts.

However, it utterly pwns Reaching Branch stance and makes Strength of Stone look like a niche, backup stance. So the 8th-level stances are not well-balanced against one another. That's probably an opportunity for improvement.