WOW! Thanks everyone for your answers, was away yesterday as it was world cup day here. (We won!)
I had never thought the problems with the earlier S65 were so evident and "unavoidable". It makes a very good point in favor of the 240s reliability and cost of ownership.
I think I'm keeping the M240...hoping they keep producing the manual and saving for a while until I can make the "upgrade".
And the growl...isn't that what the speakers are for?