DR TPII is a great rig not as good as a BP, but very good indeed.
I use the TPII for travel 'cause the ease of packing, it won't be as stable as a BP, but stable enough to dive while on vacation, another point that usually gets reported is that due to the proximity of the tank to your body, some divers (including me) experience hitting the 1st stage with the head.
The QRs are good and will last a lifetime, I use QRs all the time in Fannypacks, Backpacks, and in my BP harness, and the only 2 times I've broken one is when I've closed the truck door with the fannypack on the seat and the QR is in the way.
I won't trust them for skydiving, but for anything else in my opinion they work OK.
Of course, you may find cheap flimsy QRs here and there, but I haven't seen one used on dive gear.