They work, but...
I have fallen on these and they hold just like any other cam placed properly and the price is great especially on the larger cams. The flexibility on these guys are crazy which makes them less likely to walk. I will definitely continue to climb with them, however, my biggest complaint is how loose the trigger assembly is. I find that the lobes rarely pull evenly and that they can get themselves in funky positions. You have to be very thoughtful when placing these and watch how you pull the trigger. Also the cams a lot of time get caught on other gear and it twists the trigger pull wires and then you have to unbend them, not what I want to be doing while trying to place a cam. With the flexibility being a plus it can be a down side to the cam, when sliding it into a crack it flops around a lot and you have to really play around with finding the right placement.
If I'm taking limited gear or need to find a quick placement I reach for my BD C4s or Master cams first. If you climb in an area where there are a lot of horizontal placements, bring these bad boys for sure!