The good news - From an ex B & O technician - is that their innovative side was powerful enough for them to have the first successful tangential tracking arm. Their speakers are mostly very, very good - especially the bigger ones. Their tuners were superb on auto tracking.
Bad news - their amps (or tuner amps) were delicate. The output stage would blow if one was to disconnect with any sort of volume, or do anything to the output stage - short it, for example - easier done than you think, people would drive a nail into the speaker wire or the dog might chew through it. Worse, though, it would always take the output transistors, the drivers and the protection diodes - always left me wondering if that term was correctly applied.
Lastly, they have always been very expensive, mainly because they are stylish peices of furniture. The japanese stuff at the time, like Sony, Technics and others, could blow a fuse for the above reasons, but rarely hurt the output stages.