Upload & Sell: Off
I have 6 of them, 4 rx, 2 tx. I had 2 of them go bad on me after a bit. Radiopopper was great about it, and while they knew that I had bought them used, did me a solid favor and replaced them with new in box units for a small fee. Even after that, I paid less than buying them new straight up.
However, later on, I bought a new unit during a sale they had, and when I tried to get it to work with my Nikon flashes, it randomly would only work with my SB900, not the 800s or 600.
I've since gone onto Pocketwizard Flex units.
Honestly, much as I liked the RP units at the time, in retrospect, the "bracket" design, the slave design of it needing to work with a commander unit, etc, just makes it seem a little half baked. I do like that they are "universal" for nikon and canon since I have flashes from both.
But, if you get a good deal, I admit they have their place.