This is a straight-up reissue of Volume 2 of Deutsche Grammophon's late 1990s Complete Beethoven Edition Complete Beethoven Edition, Vol. 2: Concertos.
The 5 standard piano concertos all feature Maurizio Pollini and the Vienna Philharmonic Orchestra, both in fine form. Conducting duties are shared between Karl Böhm (#3-5) and Eugen Jochum (1,2). All 5 are highly prized recordings. I think I prefer the Böhm's more majestic vision more than Jochum's, but Jochum does nothing that diminishes Pollini's spectacular playing. The recording of number one should especially not be missed by any means - a far deeper reading than most others out there, but still featuring that dynamic intensity that so characterizes Pollini in Beethoven.
The present box is worth the price just for those recordings alone. It is less than half the price of used copies of the above linked Complete Beethoven Edition. And acquiring the recordings via single CD issues will also be more costly.
The same claims of artistic excellence cannot however be made for the Violin Concerto and Triple Concerto; both feature Herbert von Karajan's personal violin protege, Ann-Sophie Mutter. Deutsche Grammophon has many better recordings of both of these works.
The last CD has recordings of lesser-known piano concertos, the authorship by Beethoven being disputed for both. Nice to have, though again better recordings exist elsewhere.
The "glaring ommission" though is the absence of the Choral Fantasy, a "concerto" in reality by any definition. It was included in a different volume of the Complete Beethaven Edition, so I assume it was left out of this set because it was not in the "Concertos" set, which, as I stated earlier, this is a 100% reissue of. A decent recording with Pollini and Claudio Abbado exists, and is even featured in a 3 CD box Deutsche Grammophon issued with the same recordings of Concertos 1-5 as the ones in this box Complete Piano Concerti #1-5 - out of print, but available for 2X - 3X the price of this box) and is part of a single CD with the same recording Concerto # 1 Beethoven: Klavierkonzert No. 1 ). But, there are many better recordings of the Choral Fantasy.
So, the claim "Complete Concertos" on the box front is open to dispute. Other similarly labelled boxed sets I've looked at over the years have always included the Choral Fantasy.
But, I suggest again, the price of the box is well worth it just for the recordings of concertos 1-5 alone. It is nice to be able to recommend these recordings of Concertos 1-5 without leading buyers to used copies at high prices.
Note - Pollini and Abbado also recorded a complete set of concertos 1-5 with the Berlin Phillharmonic Beethoven: Die 5 Klavierkonzerte - a very good set, and has the advantage of the consistency of one conductor. But I still consider this set of the 1-5 one of the best of all time.