Originally a 3-LP set, here on 2 CDs.
The Harp Quartet has never been a particular favorite, to be honest. Clever, yes, but...oh well. It fits, time-wise.
Otoh, the Rasumovsky Quartets are endlessly fascinating (composition & performance). Unexpected/extreme cadences/modulations, dynamic extremes, and more fake endings than anything I can think of offhand.
I don't know if Beethoven was trying to impress and dazzle Count Rasumovsky or was kinda putting him on. In the end it doesn't matter because it all holds together. Dazzlingly so.
The only thing that keeps this one being every bit the equal of the Late Quartets is...the Late Quartets.
And the JSQ is in the pocket. Jeezuz what a band. I don't see how there could be better. Different, yes. But better?