I picked up a huge used rack at a pawnshop and got about $2500 worth of stuff for $350. In the rack was an Aphex 204 which I left sit for the last 2 months. I imagine this is basically like a BBE or other items. I'm off work for 2 weeks on vacation messing with all my gear so I decided to run that in the loop of the RM100. Well, now I can't even turn it off or I think the Randall sounds like total ***. I always hated to way the randall's presence structure was because you couldn't get the tight sizzle I wanted. That Exciter sure fixes it up, and it sounds like a completely different amp. I'm sure a BBE sonic maximizer does close to the same thing. I know not why some people can't live without them. It absolutely sounds like the Randall with a whole new output section. The thing adds sizzle and a huge openness to the amp. I'm a gain head and it makes every single module rage now and I have the hugeness of my Mesa now. The only bad thing obout it now is when I disconnect it I get the old randall tone I thought I was somewhat happy with and now I think the amp sounds terrible. I guess the I'll have this thing forever.