I enjoyed this comparison of 80mm F11 refractors as I was one of the lucky owners of the Burgess-TMB Planet Hunter 80mm refractors. The optics were superb and the single speed chinese focuser was okay. I agree with your assessments of planetary viewing with this fine refractor. I was lucky to meet Mr. Tom Back at NEAF just before the Planet Hunter was offered. The Burgess-Planetary eyepieces were being sold then for a wonderful discount at NEAF also. My 30mm TMB Paragon eyepiece is a very nice design also. Mr. Back impressed me - what a Great person - and his passing was a tremendous loss to all of us. Imagine all of the amazing cost effective designs he would have continued to present to us if he were still with us.
I recently purchased the Starbase 80 F10 "long" focal length achromatic refractor system and must say that the Burgess-TMB had better glass. Not a lot better, but I remember viewing Saturn, Jupiter and the Moon with similar eyepieces that I use, now, in the Starbase 80 and being very impressed with the sharpness, excellent contrast and coatings of the B-TMB. The SB80, while a premium grade F10 achromat, is not "quite" that good -probably due to it's shorter focal length. Still if is a very impressive retro telescope system and enjoyable to observe with - and the mounting system is very stable.
I wish I still had the Burgess-TMB Planet Hunter as I would mount it on my SB80 alt az and be a "happier" camper. That's not going to happen so I'll just keep enjoying the views I have with the SB80. Not many very good long FL achromats out there now. Too bad.
Clear skies, George NY.