Precisely what I wanted - had been looking for an armless chair to roll completely under the desk, that was still comfortable to sit in for over an hour.  The bottom seat surface is perhaps a bit large, almost abnormally so, but it makes for a very comfortable seat in a variety of positions (example, flat footed, or one leg folded under, or even Indian style).  Material looks good - seems easy to clean, but I'll have to report back later if it's not!  Feels just right for the price point, if not a little better.
Only potential gripe is a limited range of recline/tilt.