How many hours per day do you actually stand use a kneeling chair while on a computer, on average?
Sure standing is best for your back, If you keep good posture, but do you really stand or kneeling chair while doing work/play on a PC for hours??? Be honest!
even back then I did not spend my entire 90h week glued to my desk - taking breaks, lie down on the floor and meditate on a wicked marketing idea, exercise, etc...
But my ass had a LOT of contact with that Balans copy I was using, and it was the best at that time for me.
Standing desk is shit for computer work or playing (keyboard/mouse) imo, but for (hand)writing, drawing, tablet use, reading, etc. it is hard to beat.
right now I sit on a wooden chair pretty much like the one posted earlier, and it does NOT hurt if you do something for your back and have a not-entirely-skinny butt