The only treats from the store that I buy are from Vitakraft. I know the rest are definitely junk, since they have nuts in them and nuts are a huge no-no for bunnies. Vitakraft in my opinion has good quality treats, so I feed them to my bunnies. In limits, though.
Also, my bunnies can have fresh grass every day they're outside in their run. More veggies on the way though!