I own a Ampeg SVT III non-pro head. When playing live, I send the head's line out to the house mix. But when your amp goes out (especially with a tube amp this can happen), my backup is the Ampeg SCR-DI, which is now a permanent part of my pedalboard. I've had a chance to go and play with friends without bringing my amp -- they had a Yorkville stack in the rehearsal space. I brought only my Ampeg pedal... and plugged it inline from my bass to the amp.
Funny how a Yorkville amp can be made to sound like an Ampeg amp.
This pedal has a great emulation circuit that faithfully reproduces "that Ampeg sound". Absolutely awesome, and must be tried out to be believed. I bring this out everytime I want to avoid carrying my amp head. To record direct into a computer, this definitely has a lotta punch as well. I use it in my pedalboard as a backup for the house mix. I can plug it in and use the THRU to go straight to my amp, without modifying my sound further by adding the pedal's sound. This bypasses the pedal and continues in the signal chain unscathed. If my amp goes out, I can hit the pedal's switch and run my entire rig through that pedal, and at least keep the house mix going. GREAT backup to have!
my only issue is the pedal is heavy. it does give an ampeg sound. my bands is recording an ep and our studio engineer wants my ampeg scr-di. when using headphone, you can really hear your effects, and tweak how ever you like.