Totally rocks.
This was my first tube amp
I think this one predates "way back when" by about 20 years, although I believe it was a 4x12. If I'm not mistaken, it's distinguishing feature was its tremolo, which sounds less like tremolo and more like the voice of a horny angel. But if the model in the Axe is any indication, it also has an outstanding clear-but-warm clean tone and also a fantastic sizzle.
I actually do have some experience with the Rivera Concert. Also an awesome amp.
4x10s.
I hate to repeat myself but I CANNOT believe how good this amp sounds!