I must admit I approached this issue with some trepidation as Karajan's reputation as a conductor of baroque music is not great. However, I was very pleasantly surprised and found the music making thoroughly enjoyable. The Vienna strings sound superb and Anne Sophie Mutter's playing is a continual delight. She has a beautiful tone, great technical skill, and blends superbly with the ensemble. Karajan directs fine performances which, although romantic in style, never flag and are full of drama - for example a fine 'storm' movement in 'Summer'.
There are many approaches to Vivaldi's music and Karajan's, although not 'authentic', is thoroughly enjoyable on it's own terms. The recording balance between soloist and orchestra is perfectly judged with neither being dominant. Recording quality is of demonstration standard.