I've been kicking around the idea of selling my rack gear (aguilar db659 and stewart world 1.2) and buying a slightly more portable and less expensive GK 1001rb. This will bring me closer to my goal of owning a loud good sounding rig that can be carried up a flight of stairs in one trip. I decided to do an A/B test today and compare the sounds of my aggie pre with the preamp in my GK mbe150 combo (By the way if anyone has compared the pre's in the mbe and the 1001rb let me know). I ran each pre into one side of my stewart and then into my EA CXL112. I listened to them playing by myself w/no other instruments. Here's what I thought: The aggie sounded great no matter what I did EQ-wise. It had a nice meaty tone to it. The mids and highs were definitely smoother that the Gk's, which had sort of a metallic raspiness to the sound. There also seemed to be a sort of soft "bounce" to the attack of each note that the GK didn't have. The GK definitely held it's own, however, but only after playing with the EQ. With the EQ flat it sounded raspy and lacked bottom. I set the parametric mids to roughly the same frequencies that the 1001rb's non-parametric mids are set at. By cutting some upper mids and boosting the lows I was able to approximate some of the depth and warmth of the aggie. There was alway a slight metallic edge to the mids that I didn't like and couldn't get rid of, although I imagine this sound might appeal to the metalheads out there. The attack of each note with the GK was also harder and faster, and I mean that in a bad way, although this may be good in a band mix. Overall the aggie sounds sweeter to me but the GK is capable of some very pleasing tones with a little EQing. I may have to take advantage of the generous return policies of the local Guitar Center and check out a 1001rb. All of the above is IMHO, YMMV etc.