hi,
I can't comment on the Simaudio, but I did move from SS seperates to a Cary SLI 80, 250 watts/channel vs 50 ( in the triode mode,which I like). I like the Cary a lot more. Tube sound just seems to fit me more. Warmer and the bass is not lacking. Great for jazz and acoustic stuff including classical.
I wouldn't have believed it before I tried tube rolling, but yes NOS tubes do sound better and make a significant difference. For a small amount of money you can completely change the character of the amp, can't so that with SS. A pair of NOS 1940's RCA VT231's was a memorable experience. Now I'm working on the 6922's. And then the rectifiers and then... well it's a nice trip.
regards,
Larry