I got the RD2PB as a replacement for my ShokZ OpenRun Pro, attracted by a higher IPX rating. Sound quality wise the two headsets are practically identical. My biggest gripes are threefold:
1/ A 1-year warranty for such an expensive headset is inadequate.
2/ UX is very poorly thought through. It is small things, but they add up:
* A really poorly made charging connector. Compared to ShokZ it is very insecure. It needs to be poked and prodded until it engages.
* The UI design is piss-poor. Instead of having two large volume buttons on one side and an even larger function button on the other, I have to hunt for a tiny middle button. This is ok for on and off, but hunting for it to answer a phone call, is a pain.
* There is no charge level indicator. Read this again and again and again. There is no charge level indicator. You have to connect the headset to the phone just to check the charge level. Charge high/medium/low voice prompt, as it was done on ShokZ, would have been sufficient.
In short, watch this space. If (and only if) the headphones will serve me without fail for 2 years, I will consider the same brand as a replacement. Otherwise, it is back to ShokZ for me.
3/ Unlike ShokZ, the carry case is not included and needs to be bought separately. Not cool.
They fit well and the movement of the ear piece helps with fitment and sound.