I was worried that running the Ampeg DI into the Rumble would result in catastrophic failure of both pieces of gear. Kind of like putting Fender strings on a Gibson results in the guitar falling apart and destroying itself right before your eyes, but luckily for me that didn't happen! Was in the market for a DI and was going to pick up a Radial J48 or JDI, but figured although it's obviously not the same, with the Ampeg I'd get a nice overdrive and a totally different tonal option, along with the Headphone and Aux options. I'll get to the point, it sounds great, and when it's engaged it sounds like an Ampeg. Obviously disengage it, and it's back to Fender tone! Sort of like the best of both worlds and a very versatile little unit (that's what she said?!) I can take the SCR-DI and just my bass and head over to a friends place to record. I can use it at home late nights to practice quietly. I know it's a bit unconventional, but this combo is now really versatile with the Fender and Ampeg sounds at the touch of a button. The kicker is though if I'm playing live I think I'd just have to use the Line Out on the Rumble (not really a true DI) and send that to FOH if I wanted to be able to have both sounds going through the PA, because if I just went DI out of the Ampeg SCR-DI it obviously would just be the Ampeg tone going through the PA the entire time, but that also may not necessarily be a bad thing, since I'm kind of liking how this thing sounds. The Fender's tone is rounder, warmer, a bit softer around the edges, while the Ampeg is a little more defined, tighter and punchier. Like I said, it's nice to have both options, and for what I got the Rumble for brand new plus the SCR-DI, I'm in it for about the same, or a little less of what a PF500 and 2x10 cab would have cost me.