My first amp had issues, likely in the power section, as it produced terrible sound and eventually stopped working altogether. Thomann replaced it with a new amp, which is absolutely amazing. It effortlessly covers every genre, from metal to blues. I love all the channels: the clean channel is pristine, the green channel ranges from bluesy crunch to a Marshall-like overdrive, the purple channel is tight and excellent for rhythm with low gain, and the red channel delivers creamy solos. I highly recommend this amp, even for non-metal players.