I bought these recordings because they were on offer, and could not have been more disappointed with them.
Herbert von Karajan was one of the most prolific recorders of all time, and he volume of recorded music conducted by him with the Berlin Philharmonic and other orchestras is massive. Some of that music is unsurpassable (especially early recordings of Wagner and Strauss, and late recordings of Bruckner and Mahler), but other recordings are less successful. These recordings come across much as I suspect they were: recordings professionally churned out for commercial gain.
What is especially disappointing about Karajan's recordings is his growing fascination with beauty of sound at the expense of all else. This obsession is very much in evidence in these Mozart recordings. Karajan's Berlin philharmonic play everything with a languid legato that takes all the excitement out of these recordings. Instead, what one gets is a set of recordings lacking rhyhmic definition, tension or excitement. The faster movements are particularly unsuccessful - the first movement of the famous no. 40 is dreadful.
There are much better recordings available. If you want the Berlin Philharmonic, buy Bohm, not Karajan.