The only one I have so far is a high-frequency hiss when the volume is at 2 o'clock plugged in direct. It just seems excessive to me. Also, it's strange, but when I plug in thru my pedalboard, the hiss is amplified... something I don't get with my LMII+Schroeder 1210 setup. Other than that, the amp seems to have enough power. I still want to try a lightweight 1x12 with it.