I have 2 rx200's. An original black one and a newer black and red model. The black one is my daily carry work mod. I work in construction and usually keep the mod in my back pocket.
Aside from severe paint wear on the black mod I have not had a single issue with either rx200 whatsoever.
That said, I did pick up a DNA Reuleaux a while back and now undoubtedly prefer the DNA 200 board. I don't even own a PC, have never modified the DNA programming whatsoever, and it is still a much better vape than the RX.
The biggest difference, to me, is the immediate ramp of of the DNA. From stone cold I hit the fire button and I'm immediately getting the vape I desire. On the RX, the first pull from stone cold is weak and anemic. Subsequent pulls are where I'd expect them to be. I've heard people say that increasing the wattage on the RX should compensate for that, but just doesn't get it where it needs to be imo.
Once I pick up a Triade the DNA Reuleaux will probably become my work mod and the RX's will be shelved as emergency backups or sold off.