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From my sample size of one, I had no problems with it. I also kept an eye out for threads about the 650A on various web forums (fora?) like you do when you own a product, and I never saw anything about problems with reliability.
You would imagine if 8/10 were defective the web would be full of it as there is nothing we all enjoy more than a product witch hunt.
Hmmm, perhaps you should not take this seriously, after all, if you read the other forum post "cheeky sales rep," you will understand my assumption that not all heard should be classed as competant information.
Cambridge audio would be out of business if they were producing 8/10 defective units.
Be wary of rogue reps, they give the good majority a bad name, and there are alot of very good hifi vendors out there