Sorry to hear that, Henry, about customer service.
I have dealt with Canford's a few times now for replacement parts, and a new boom and found them very good and responsive to my inquiries.
The Panamic Maxi that has 3 stages and goes to 14 feet. It has been our go to pole for drama for over 20 years now. We have 3 of them now, and a 4 stageSsuper Maxi 16 footer - "built well, and just feels good to use" No experience with a 5 stage Panamic.
The 14 foot Maxi is very light and stiff, collars work flawlessly, repair parts available, and everything I use has the Panamic quick release attachments on it.
My VdB documentary booms have the fittings added for the Panamic release, as well as my super shorty Ambient.
I guess you are aware of the caveat about tightening the Panamic quick release - find the end of slot and make sure the flange on the thumbscrew seats in the circle, not just close. (just a tip for anyone new to Panamic)