In the past I've burned myself buying cheaper products instead of official ones, but they worked pretty well and I'm very happy with them. They fit perfectly on my quick release head, no problem. I'm curious to see if the rubber part degrades faster than the more expensive product, but I'm pretty sure it will last a while anyway. The small C-ring held by a 1/4 screw seems to be the only part that isn't that impressive, on a record the ring is a little loose but it could probably be tightened if