I have no experience with the VR5s but I have had plenty of time to compare the Rogue and the Atma-sphere. The Rogues, while very good amps for the money, are completely out-classed by the MA-1 Mk II.2s and sound quite opaque (in either mode) in comparison. For an OTL design the MA-1s are relatively low impedence tolerant. That said, they do seem to perform better into loads of 8 ohms or above but they will still perform quite well into 4 ohms. If the impedence of the VR5s doesn't drop below 4 (the website seems to suggest that it does not) the MA-1 should be fine. I consider the M-60 & MA-1 to be the best amps I've heard, SS or tube, capable of driving a wide range of speakers.