Hey, yes, I have, at this point. My disclaimer is that when I first encountered bad feedback issues, I was over at a friend’s house using his pedals. He was the one that suggested I look into Feedback Busters, which come in stock sizes for guitar (made of rubber and look like ashtrays). I haven’t gotten back over to his house since I ordered and received my Luteholes to try them out with his pedals. He had one that I really liked, except for the feedback issue. All I can tell you at the moment is that the Lutehole covers are gorgeous (you have to order them custom sized for your uke) and look great on the uke, but am not sure if they will defeat the feedback problems I was having with my friend’s pedals. He doesn’t live close by, so I’m not sure when we’ll get together again. I did join the “pedal of the month” club at the local Rock-n-Roll Rentals shop and have tried some other pedals, but they didn’t cause any feedback. Unfortunately, the effects weren’t what I was hoping for, either. Anyway, once I get a better sense of how well the covers work, I’ll follow up with another post.