Advantage360

It was worth it for me; I don't regret buying it at all. I type much more than the average person, and a Kinesis board is the only thing I've tried that doesn't give me wrist pain. I use the Adv360, but you will get many of the same benefits with the Adv2 (better hand positioning, contoured keywells

It was/is absolutely worth it to me (I have a collection of what's now called the "Advantage" keyboards going back to about 2000) as I had a nerve injury in one arm that prevented me from using "normal" keyboards for quite a while and redirecting certain keys to stronger fingers made a big differenc