please count me in as well. I have a bx4500 head playing through a carvin 15 and a carvin 210. I have had a couple carvin amps, fender, and hartke 3500. Out of all of them, i actually like my behringer the most, just needs a little more growl, and needs the ground hum taken care of, I'll have to do some research and figure how to do that unless someone wants to post a how-to.
As far as the lack of growl, I'm STRONGLY considering picking up a v-amp, the rack mount version. And when I change my cabinets, they are literally falling apart, I'll probably go with behringers as well.
the ground loop that causes the hum comes from the footswitch input on the front of the head, a very simple fix is,,,,
remove screws on top & bottom of head
carefully slide amp out thru the back of enclosure
locate footswitch input
remove screws, ( or nuts ) that holds assembly to chasis
take a small piece of 3/8" heatshrink tubing & fit over the threaded part of the footswitch input that goes thru the chasis
apply heat to shrink heatshrink tubing
enlarge hole in chasis either with slightly larger drill bit, or rattail file , so input will fit thru
place thin fiber washer, ( or plastic, rubber) over input on interior of chasis ( may have to enlarge ID of washer as well )
slide assembly back into chasis
place thin fiber washer over input on exterior of chasis, ( may have to enlarge ID of washer as well )
trim heatshrink tubing back to washer to make room for nut
install nut
install screws, ( or nuts ) that hold assembly to chasis
slide chasis thru back of enclosure
install screws on top & bottom of head
basically, all you are doing is isolating the footswitch input from the chasis,, it turn breaking the ground loop & hum
head will be absolutely silent after this very simple mod