I too have the AcousTech, not Premium, though. I have not heard the Vibe. Whether you like it or not quite depends on the rest of your equipment and your taste. I did hear the opinion that it could be too smooth and a little slow for some. I would also jump to Insight if decided on Sutherland - that was Ron Sutherland's recommendation.
I don't have direct experience with the KC Vibe but do own a Sutherland designed phono preamp (AcousTech PH-1P) and have been enjoying it matched with a Gyro SE and SME 309. Sutherland's phono stages consistently get high marks and when the time comes to replace my PH-1P a Sutherland phono stage will definitely be on the short list.
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