I've got to get one ordered for at home - keep forgetting!
I have the backless version at work. I wheel it between the cubicles, depending on who I need to be working with (there are only four) and my staff also uses it as they need to. We had a cheaper one and it wore out, but this one is doing very well. We've had it about 6 months now. I'm also a bit well endowed below - and find it very comfortable to sit on. The first one was smaller in diameter, and not as comfortable.
Everyone finds it comfortable and well built. Even the shop guys liked it so much (they us it when working with the Purchasing Agent to select something specific online - easier than standing and leaning over) that they had her order them one for their area too.
I'm going to get another backless one for my "machine shed" so I can easily roll it around depending on which machine I may be working with at the time.