Not a fan of anything under 50 watts but YMMV......I have a modded 5 watt single ended cathode biased EL34 Jose/2203 Marshall circuit 1x12 practice amp that is great at lower volumes but all of it's shortcoming reveal themselves when you really turn it up.
All this mini stuff is cool, but it will never reproduce amp tones and feel of large transformers and tubes, they may get close to the tone but the punch and the overall feel will be lacking. I'll be the first in line when a mini truly sounds and feels like a 100 watt amp.
That being said the Blug Iridium/Mercury 100 watt nanotube amos seem to do this by all accounts from the owners but I have yet to actually play one in person.
IMHO there is a difference between the SLO100 and SLO30 for the aforementioned reasons.
I think the EVH iconic 5150 got things right with JFETS for the gain stages and then a full tube power amp section but he amp has full size iron.....but that's just my observation...