I owned an ls25 mk1 for awhile and thoroughly enjoyed it. I tried a ref1 and couldn't get it out of my system fast enough. Everyone rave's about the ls5 as I'm sure you're aware (I've never heard one), but it has no remote and is all xlr input/outputs. Always wanted to try the ls25 mk2 (never heard a 6h30 based pre), but after exhaustive research (and too many people saying 6h30 is more ss sounding), went with the Aesthetix Calypso and could never go back to the ls25 mk1. I do believe that I'm going to own this Calypso for many, many years. But again, I did enjoy the ls25 mk1 while it was in my system. FWIW, hope this helps...