Have you sat on a stool like this for any amount of time, eg. as long as it would take to leisurely service a bike or build a wheel?
I built a lot of wheels sitting on a tall non castored Park Tool stool, as you might at a cocktail bar with one leg on the lower cross rail and the other on the floor, just in case. Usually only a pair at a time, so rarely longer than an hour and a half, unless they involved carbon rims, softy aluminium nipples and silly stretchy bladed spokes, when bad things and longer times could happen
Do you want castors? Do you want a backrest? What seat size and shape is comfortable for you? Do you want it height adjustable?
Castors and moveability an absolute
must. My back's fucked, I don't sit right, so a backrest seems an irrelevance? Swift easily accomplished height adjustable also a
must. Just measured my bum so thinking at least 10" in diameter + some more for good measure?
ps I always wanted to be a drummer first and foremost, but chose to be a bass guitarist - less to carry (1968 Hofner Violin before a Fender Precision that was so heavy after an hour I was on my knees and with lopsided shoulders). I was crap anyway, and would have been even worse as a drummer