I'm all for a rolling office chair.
My sewing room has Pergo flooring and a rolling chair is perfect.
Like others, I went to Office Depot and sat in every chair until I found the one that was most comfortable to me.
(An arm-less rolling fully-adjustable chair)
I nearly choked when I saw the price..
All I could think was that there was no way I would pay that much for a sewing chair.
However, my husband was an excellent voice of reason.
He pointed out that if I wasn't comfortable, I would not enjoy sewing/quilting as much.
I have never regretted buying that chair!
In this case, he was right.
...but don't tell him I said that. ;)