I still like the M610 a lot..it adds a tube warmth to the Brauner mic that I now like..the Senheiser 416 got a lot of extra kick and (some) added warmth from the 610. It is a solid preamp that won't dissapoint unless you are a massive audio purist..It does add a little colour, but it is adjustable..The Seventh Circle Audio (SCA) preamp is a very hot amp..very very clean, clinically clean and quiet and BIG sounding, but AFAIK not a lot of headroom..hot mics need a pad inserted..however I just completed a big TV project with it, and loved it. I needed to get these. Takes about 5 weeks to get them built and shipped. About 1000 bucks for the single module with the one-unit rack/power unit that can accomodate 8 modules. SCA makes a Neve clone and an API and Millenia also The 610 can be had for less..and it is good. If you like a money saver, check the Groove Tubes "The Brick" HUGE sound..nice tubey sound, and cheap at about 350 bucks a throw. I add a tad upper mids, and it rocks for not a lot of cash