
If it's anything like this one. it doesn't sound too special, at least not to me.
https://www.youtube.com/watch?v=q_1JNsPO2Bk
He may well be overdriving the thing in that video, but even so, it can't have a terribly large spring tank in a unit that size. On my RV3, the springs take up most of the width of the unit and it's a 19" rackmount.
I have been looking to get one of these. It's a spring reverb unit for home hi-fi systems.
Sound engineer Tom Elmhirst uses these in the studio. From what I have heard, he used one on some Amy Winehouse and Adele tracks. Just google that, it's pretty interesting. There is also a tube version too.