Bumped because I'm interested, also.

My perception is that they are noticeably heavier, but also more supportive. I like them, and I'll train in them, but I think I prefer the original version for racing at this point

I haven't noticed any weight differences. If they are heavier, it's likely because the upper is roomier, particularly in the toebox, and it no longer has the razor tongue, rather a nice padded tongue. I guess this would add a very marginal amount of weight.

The 2's are definitely a more comfortable fit in the upper, without any change to the midsole. I'll be running in these in Kona.

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http://www.josh-amberger.com/

Per the specs they are ~10% heavier (7.6 vs 7.0 before)

Not sure how meaningful that difference is, if at all

Agree that the toe box is roomier, which I like

i have the original and they are very narrow. I will avoid the Tracer in the future.