I bought one of these a year or so ago. Barely used, as I love the look and don't want to ruin the rif outside. I've only used 2s and .28's, and find it more than adequate. I've watched YouTube and read forums and it seems if you run it with 3s you will burn the MOSFET quickly. I may get a perun (or similar), ahead of time and be ready for the inevitable. This MP5 is too nice to be stuck on the wall or the back of a cupboard...