PocketWizard radio triggers... I love 'em. 95% of the time I have zero issues and they are worth every penny spent on them. That's saying something too, because I own 7 of them. My current PocketWizard arsenal consists of: 4 - FlexTT5's, 1 - MiniTT1, 2 - PowerMC2's, 1 - AC3, and 3 - AC9's. There is one flaw I've found in the PocketWizard FlexTT5's hot shoe mount (the part that tightens to the camera end) is not built out of the strongest material. It performs just fine when mounted by itself to a camera to trigger other radios, however, if you slide a speedlite onto the Flex (it's intended use), the added weight and torque that the speedlite can apply to the Flex's mount can become too much and... it breaks, rendering that hot shoe mount useless. It's kind of shocking that PW didn't think this one through, or even make a change in future production of the product after what I'm guessing is a very large number of photographers having this issue. A speedlite/Flex rig can easily put a couple pounds of force on this single small piece of plastic (and especially stressful on the mount when the speedlite is situated sideways), and it's only a matter of time before each and every Flex hot shoe mount will fail. Why it's not metal to begin with is beyond me. Good news is that you can call PocketWizard up, tell them your problem, and they will send you a new mount to replace the broken one. The bad news is that it'll cost you $20 per replacement mount. The repair process is simple enough to do yourself in under 5 minutes, but frustrating that you have to do this to begin with.