I thoroughly recommend this set of Vivaldi's Estro Armonico. I had only come across a few movements of these concertos, and wanted to get to know the complete set. I was guided to this recording by "1001 Classical Recordings You Must Hear Before You Die" by Matthew Rye (book available on Amazon) - not his first choice recording, but much cheaper as an MP3 download!
Since downloading the 12 concertos I have enjoyed listening to them many times. I find every aspect of the performances completely satisfying. Biondi is terrific as soloist; the ensemble is excellent; the interpretation is sparkling and inspirational.
If your experience of Vivaldi goes no further than the Four Seasons - and even if it does! - then this essential listening.