I've had one of these for about a year and a half. It is extremely quiet, very dynamic, and has lots of gain for even very low output MC cartridges. It would be unfair of me to compare it to other phono stages with which I have only passing familiarity, but I can say that it is much better than the Audio Research PH3 SE. It is different than but pretty much the equal of and perhaps better (quieter) than the legendary Magnum Opus phono stage that preceded it in my system - and it is quite small and easy to use. One downside is that it is not user adjustable, so you have to have a pretty good idea of what loading the cartridge you use performs best with and either buy the Groove configured that way or have it adjusted to fit.
I love mine and intend to keep it for a long time.
I love mine and intend to keep it for a long time.