I haven't heard the Omega QR, but I've listened to the Omega XC as a PC for power distributors, and it's amazing in that application; reminds me of a Porsche 919 Hybrid Evo at the Nurburgring Nordschleif; that puppy can pass some serious current.
I've heard the smaller Omega QR, the QR-s, which is designed for source components, and is based off of the Alpha NR v2. For source components, it's astonishing. The QR/BB device in the QR-s really brings truly impressive immediacy, dynamic slam, 3-dimensionality, and spaciousness to the presentation. It can really transform a DAC or phonostage, etc.