I owned a SV-237 integrated for a while and really liked it. I upgraded to a Simaudio 600i, which is better, but only incrementally and quite a bit more expensive.
Other integrateds I've owned - Audio Research Vsi-55 (I still own it), Peachtree Nova 300, Peachtree Grand X1, Heed Elixir. I like the sound of the Vsi-55 a little better than the Vincent, but the Vincent has a lot more power and can hold its own. The Vincent was better than the others mentioned, although the Peachtree units are both very nice, just not quite as much body as the Vincent. They were a little rolled off on top like many Class D units.
The SV-237 responded very well to some better tubes. I didn't like it at first with the stock tubes (kind of edgy), but it sounded great when I replaced them. Some of their units have the tubes soldered in (which I think is kind of weird).
The guy I sold it to said he liked the sound better than his McIntosh gear.