I know I'm interested, since I'm 290 lbs and I was looking for a rolling seat, too! Thanks for the tip.

Edited to add: there are almost 2900 reviews on Amazon, 83% 5-star and 12% 4-star. So far so good.

But the (small percentage of) 1- and 2-star are concerning. Apparently quality control is hit-or-miss (drilled holes mispositioned or omitted entirely) and a common complaint is disintegration of the caster ball bearings. This is giving me pause...