I quite like them, to me they are quite similar sort of balance to the old BBC related designs from Harbeth and Spendor, although they are more advanced technically.
Foams go on the woofers, you can get replacement drivers or new foams though. I wouldn't pay more than £300 for a mint pair and a lot less if the foams are gone.
Very late reply but WHAT????? The RL45's are absolutely HORRIBLE and the nearest speaker we had to them which you may remember was the Linn Index. Both had screaming mids and subjectively no top and bottom to help out. Nothing remotely like a Spendor, Rogers or whatever, let alone a Harbeth...
Or are you talking of the MC120s? I'm confused now.. I never heard the top models (maybe a set of M70's which weren't too bad). You should have got a set of 5702s which was a compact version of the Celestion Ditton 66 and a very serious speaker, especially in the early 70's when they were current. I was always fond of the Goodmans based 3800 but the tweeter was always just a little 'hot' I remember.
The RL60 was better and the RL140's actually not bad at all I remember. In all three, peeps on Beoworld upgrade the cheap electrolytic caps routinely and I remember B&O did an upgraded DIN speaker caply rather than the bell wire usually provided.