It's actually a really cool system, I had an opportunity to ride the Marek/Marek setup a few weeks ago. Made it very easy to adjust angles and widths on the boat, I didn't notice any more heel/toe lift then a normal binding has. The Marek boot was too stiff for my liking, but thats about the only bad thing I have to say about it. If you had one board for multiple riders I can see the additional expense for the setup being worth it. However I very rarely change my stance once i get it set up so it's not really anything I'd go out a buy just to have.
If HL dropped the price and threw that system into an entry level product it would probably sell like crazy.