Just my $0.02 worth re UT:
-Keith Rucker – can't stand the constant yap, and from some of the casting pattern work he has shown, he is winging it, at least with castings, and is getting a lot of coaching from the foundry. Nothing wrong with that but he would like to portray himself as a master of all old technology. Mostly yap and not much "work" content. The steam stoker engine seriesis a good example. Probably a dozen videos and just finished disassembly!
-Adam Booth – definitely getting commercial, BIG ad plugs midway thru on most videos.
-Blondihacks – honest and entertaining, with humour, she is a beginner at steam models and openly says so.
-Doubleboost – honest and entertaining, with humour, Newcastle accent a treat to listen to. No embellishing in his videos, if he messes up he shows it, warts and all. Does tend to shill for Banggood stuff a lot though.
For electronic related stuff – Big Clive is very informative on electronics and a lot of fun. The continuing silliness series with the electrocution / incidental heating of various foods is entertaining. He's done pork pie, Scotch Egg, spotted dick pudding, Dutch Rookwurst and others, to date.