Although I could not give you a review on the technical aspects of this collection, all I know is that I have really enjoyed listening to the music. Some of my favourite Beethoven pieces, - all beautifully played. And, of course, there is the added bonus of the Choral Fantasia, - one of Beethoven's lesser known works (possibly) but one that gives me quite an uplift. All in all, - an extraordinary buy in terms of value for money.
EMI has released several versions of the Klemperer/Barenboim/NPO Beethoven piano concertos, so why pay a fortune for the one here when you can get it much cheaper and with exactly the same quality (2006 digital remastering) here Piano Concertos 1-5 / Choral Fantasia and here Beethoven: Complete Piano Concertos? Same applies to other EMI releases, so search before you buy ;)