They play very well
They play well, a very clean interpretation. I think they may be a starting point to Beethoven Quartets.It is possible to hear every instrument at all times and it is fine to know each part. But I like several other quartets in Beethoven.

Great Sound and early quartets
The Berg Beethoven is big and juicy and this suits the early quartets. Their sound and the recorded sound are certainly the best you will hear. The later quartets miss the introspection of some of the other great string quartets.
A great bargain and tops in sound!!!

Good but not great
I guess I'm just used to Haydn and Mozart, because these string quartets were just too dissonant and untraditional for me - one who loves the Beethoven symphonies. To each his own, as they say. The recording itself is terrific - great engineering.

VERY HIGH QUALITY RENDITION
All the performances on this set of the Beethoven String Quartets are of the highest quality. Particularly outstanding is the performance of Op 59 no 1
Intonation, expression, the ability of the players to meld together, and the dynamic range is all superb.
One small flaw (nothing to do with the playing)
In the very last track, the final movement of the B flat quartet (not the great fuge, but the movement Beethoven replaced it with), there is a continual flapping sound - I don't know where it came from, but it is very irritating, and I'm surprised that EMI let it through.

All you need to know about String Quartets
This boxset has everything you need to know about String Quartets.
If this is not enough to mention, we can also remember that the musicians here are one-of-a-kind, and Beethoven wrotes the most rich and precious Opuses for String Quartets.
Enjoy yourself!