Tim Ferris has a pretty good post on it: http://www.fourhourworkweek.com/blog/2009/01/27/office-chair-aeron-vs-mirra-vs-liberty/ http://www.fourhourworkweek.com

Tim Ferris has a pretty good post on it: http://www.fourhourworkweek.com/blog/2009/01/27/office-chair-aeron-vs-mirra-vs-liberty/ http://www.fourhourworkweek.com/blog/2009/01/27/office-chair...