The music on this CD comes from three separate sessions in 1976 (the solo concertos), 1980 (Concerto for Two Violins) and 1966 (Concerto for Violin and Oboe). Alexander Schneider conducts the ECO in the 1976 sessions, Mehta conducts in 1980 -- a recording of a live performance -- and Bernstein is at the helm in 1966. The two solo concertos are warmly played and nicely recorded, but they are, frankly, on the dull side. Schneider and the ECO just sound heavy and a bit slow; for example, the Andante second movement of BWV 1041 doesn't feel like an andante to me. It's all just a bit too sober. On the other hand, the double concertos are full of life. The orchestras are arguably a bit heavy, especially in the 1966 session recording, but both Mehta and Bernstein bring plenty of spring to the playing, and the soloists seem challenged and invigorated by playing together. I think the Concerto for Two Violins works particularly well -- Mehta strikes just the right tempo and rhythm, and Stern and Perlman go at it with enthusiasm. The recording is a bit less refined than in the 1966 and 1976 studio accounts, but the gain in energy more than makes up for that.
NOTE: If you insist on period performance, don't bother with this -- but you would be missing some lively collaborations.