You shouldn't buy this recording for David Oistrakh's immaculate fiddling. Neither should you buy it for the ensemble playing of the ORTF (French National Radio Orchestra). Nor, even, should you buy it for the excellent re-mastered sound quality. You should buy this disc for Otto Klemperer's unique grasp of the structure of one of Brahms' masterpieces. It is a monumental performance, so much so that the virtuosity of the soloist becomes almost irrelevant against the revelation of Brahms' power, passion and structure that Klemperer brings to this work. The total effect is like being afforded a glimpse into a musician's very soul. If you're an Oistrakh fan, he recorded this work several times with George Szell et al. Milstein and Heifetz also made memorable contributions, but it is this one which brings home the bacon.
Consummately performed by the brothers Oistrakh, the Sinfonia Concertante by Mozart is a charming irrelevance - beautiful bistro background burble. Enjoy.