I put on the old style KMs, of course right before they came out with KM2. I have 16s so I would have had to wait a while until they came out with my size.
The only advantage I could see, from the mags reviews, is the new ones are quieter on asphault.. Nothing wrong with that, I know my KMs are tractor loud. Once you get going on the Highway, it doesn't matter.
In sand, they are awesome.