I used a Focus 1 last night (NYE gig) and pushed the snot out of it at times and it never even got real hot. No noticed loss of low end either as some state may happen. Used a Lakland 55-94 and early 70's Jazz with a Demeter EQ pedal engaged. And a LDS UL-212. At times there may have been an octive pedal and/or a envelope follower going as well. The little thingy roared!!! May have to pick one of these little suckers up to use so I don't have to lug around my Demeter/Carver rack anymore! It rocked!!! It's on my short list of must haves!