bought these brand new in 09 to go on my K2 board. only problem i've had is when you get to the end of the ladder ratch, it starts skipping and missing. you have to pick up on the end of it to make it catch and progress. this is on the left binding only. i took it to the burton store in vail and all i got was 'yeah, mine do that, too'. i'd heard burton wasn't aces in the binding dept, though. it still works, it just skips at the end....kinda like my indicator that i'm fully ratched in.
besides that, the back board broke on chair 4. i took it in and they swapped it out free of charge. **key thing here - turns out everything from burton after 05 or 06 is guaranteed! dude asked how i did it, i didn't know (found out later it's the chair that drops down on it and crunches it). no problem, he simply replaced it instead of me shipping it off. so, pretty good binding, excellent warranty.