Now I owned the first tube. I buy ARC VSi55. The reason is I was audiotioned it in the very similar system to mine. Accuphase CD (although different model), VSi55 and 1sc. I feel OK for the sound. Furthur more there is a demo one with minimal use and significant discount so I decided to buy it. I'm not try sweet Cary for comparison.
Here is about VSi55 that I find. First the building is look good and strong. The first impression for me is " Dynamic..dynamic" like solid state more than I expect for tube. The speed is fast and good impact. Precise image and good sound stage. The sound is airy in tube way but not too sweet and colour. The mid is refined as tube, good bass but not deep. However there is a subwoofer output if u need more deep and extended bass.Now the sound was changed everyday so I think it's not completely burn. However I think it's mate for my system, some sweet and refine mid from CD, attenuate pin point image from 1sc. I can listen to more music including soft rock and classic.
For conclusion I think it's intregrate tube amp with hybrid sound.
Lastly, I'm only 2 years experience audiophile. If anyone don't agree for my comment. Please correct me.