I've found my friend's 50W rockerverb to be FAR quieter than my 50W JCM800; His rockerverb on full volume is about the same as my '800 on 4 (master volume at 11o'clock)
If we're jamming at home level volumes, he has his rockerverb on about 1-2 and i have my '800 on about 0.1-0.2, lol
The rockerverb in my experience is a great amp, and it's a bonus that it's not as loud as some others which are just ridiculous. It has a very rich and clear sound. Enjoy