The music is great -- buy it, but buy it in the four separate recordings. (5 stars for the music, but the 1 star is for a very poor compilation.)
In this compilation, the first two discs have been mixed up (so the first two concertos are named 1&2 but really contain the music of 5&3, and the second two concertos are named 5&3 but contain 1&2). Moreover, the very first track, (named "Piano Concerto No. 1 in E flat major, H. 27: I. Allegro" which is really the first part of concerto 5) is inexplicably truncated at 3.47 (ends abruptly in the middle) whereas the full music is 17.23 long.