BAT pre with Pass Labs amp



I am considering pairing a BAT VK-51SE with a pair of Pass Labs X600s. No dealers nearby to demo this combination. Anyone have experience with this combination, or something similar? Thanks.
jadew
I have the VK-30SE and X-250 and they worked fine together. It would not be a weak link in that system.
I also got a Pass X250 and I am thinking of upgrading my pre-amp. Should I get a X2.5 or something from BAT? How would you compare the two?