I have a CJ CT-5 which uses the same tube. Prior to that I owned a CJ 17LS which used the 6922 tubes. Partly depends on what your after. Tube rolling offers many benefits (and frustrations too) but ultimately keep your focus on the preamp itself and not the tubes its uses. Trust your ears, if you like what your hearing you'll be fine. BTW, those BAT preamps are great. Well built with great support if you ever need it.
Good luck
Good luck