It’s just really oke, nothing special in my opinion, but there’s nothing to really complain about either.
There’s no master volume so you can’t crank the volume into the tubes to get saturation, because you can’t control the volume after the tubes, so the volume coming out of the preamp will be way to loud if you want to get the tubes going.
I knew this when I bought it, but though it would still give me some character, but it’s so minimal it’s not really worth it in my opinion.
I returned it because in a mix you can’t hear the difference between this and a basic external sound card (in a professional studio environment).
If you don’t own any preamps, this could be a good option because there’s really nothing wrong with them.