Oh HELL YEA!! for anyone whose not old enough to remember, Lines old transfer boot used that exact mechanism in the heel flex. the boot had some issues, but was nasty. same 3 piece shell as the dalbellos and full tilts.
the thing in the back allows you to do sooooo much, it locks the cuff in any place in its flex, including letting it run unlocked (think flex, but in reverse). the one on the line boot could also switch the upper cuff from locked to the lower to hinging. it was one of the coolest systems ever if you could figure it out. i think the reason they didnt catch on more was cause they didnt mention how it worked at all, so nobody knew what it did.
whats so cool about them, is when they are in the "walk" mode, you can manual like a motherfucker with no shin pain, land crazy backseat, carve switch easier, etc. im definitly gonna be pickin these up.