Well, I haven't made a major switch yet, though I did have the 88 upgraded by Rogue to the Stereo 90 board, which gave me 30 more watts in UL mode and the option to switch to triode on the fly. I wish they had made the biasing area more accessible, instead of having to remove the cage, which uses 10 screws, but oh well on that.
I'm still considering Conrad, though I have also wondered whether it might be worth keeping the Rogue amp for now and getting the ACT2 preamp, the new CJ flagship. I've heard also that the 2nd gen of the 17LS is absolutely stunning, and am hoping to audition it soon. I had the 17LS in my system for a few days. The soundstage seemed wider, and the highs had this beautiful shimmer that the Rogue 66 lacks. I still love my Rogue setup though. Rogue is a great company, and I have their Tempest integrated in my bedroom system powering my B&W 602s. If I ever hit the lottery, I'd get the ACT2/140 from CJ for the downstairs and move the 66/90 combo to the bedroom!!
CJ does have a beautiful sound. I couldn't believe what a difference their EV1 phono pre made in my system, especially since it isn't too many $$$.