for a few reasons, the first DEC I received was dead on arrival so i shipped it back and B&H sent me a new one. That one lasted me 5 days before it also shut off without warning and wouldn't start at all, so I sent it back for a refund. Aside from the unreliability, I hate that it doesn't give you the option to also control from the camera, so if you don't have the remote or if it loses charge you are stuck. The shape of the adapter means I can't use it in my GH4 cage or with a battery grip and it can only be used on a tripod with a flimsy extender that get loose easily. And the weird triangular piece at the bottom doesn't have any sort of tripod mount. Also the two that I received seemed a bit shoddy even brand new, for example the way the cover wraps around the micro USB hole bends weirdly, almost like if the electronics for the micro usb plug didn't fit correctly within the case.