Definitely worth it. The best write up I've seen explaining the pro's and con's of an Aeron is here: <http://www.amazon.com/review/R1MUWGLPM341EB/ref=cm_cr_dp_per...;

I was also doing this research and definitely Aeron is the way to go. My other chair after sitting in it for hours caused my lower back to hurt. If you sit for hours on end working like most of us here, Aeron is the only choice.

Like Staunch said, make sure to get the lower lumbar support "Pad" not the "PostureFit" option. The above link explains why PostureFit is more or less useless even though it is a few bucks cheaper.

Hope that helps!