I had read about this version of the concertos. I also have an excellent version of the Goldberg variations, with Murry Perahia playing. I found his plying both engaging and refreshingly uncluttered. I have heard a few of the performances in this collection that a friend of mine bought.
I am delighted with the quality of the recording, the character of the performances and the side benefits of getting a collection rather than looking for individual discs.
I am no fan of MP3, you may as well buy rubbish speakers. I like the12 discs of proper CD recordings. I have not yet been tempted by digital downloads for classical music.
If you enjoy Mozart, then Murray Perahia's performances will surely delight you. Highly recommended as a first choice. Make sure you listen to this collection before opting for a different version.