I seem to remember hearing something about that, as well...
BUT, we went 4X4ing with a guy, a couple weeks ago, who has them, and uses them HARD (rock crawling -- truck looks like a wrinkled up prune) and his tires looked OK.
They worked ALOT better than I would have expected, also...
maybe the older ones had a problem, that thye've since taken care of...
-Marty
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