I am very satisfied with Maton Feedback Buster Mini Maton, it serves me well in live format with my Mini Maton guitar. It sits well in the sound hole, it's firm and doesn't move around. The price is a bit too high compared to other feedback busters, but it's specific size so there is not many products to choose from. The Maton Feedback Buster passed quality test when my dog stole it away from me - he did chew on it for while but did not do any damage :)