Coincident 300B Statement Linestage Preamp Experience?

I too interested in this as my present Coincident 101D continues to have reliability issues with the Psvane and Linlai tubes, this even after filament voltage mod performed. 

Recently purchased Tektron DHT pre, custom build for former Tektron distrubutor in USA, this uses 71A or UX112A tubes. Still in evaluation phase, very nice this far. 

Only DHT pre for me going into future, the new Coincident 300B is a contender along with other custom builds from smaller manufacturers. Vinnie Rossi also offers 300B, Thomas Mayer also has DHT with transformer volume control.

Thomas Mayer is the one who said that 300B is not a great tube for preamps (I was inquiring about using the Elrog 300B with the Coincident 300B preamp). With that said, his middle road pre is too rich for my blood (17,500 euros or so). Coincident equipment is costly but extremely high value IMO and I’d love to take the plunge if I could just de-risk the purchase a little. (Coincident doesn’t have a trial period—you buy it, you keep it).