I had the exact same question! Here's to several responses!
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I now have the kit 3
the integration between the drivers is better and there is more detail and less of a sonic signature, especially the bass, it is less colored and tighter. I did not notice much of an improvement in efficency however despite a 3db better rating (97 vs 94)
Overall I recommend them - however you may want to find a factory built set if you can, they are supposed to be better than the kits per Peter Q if you look in the kit brochure at AudionoteUK.com
let me know how it goes