I don't think it would be a case where a dozen people would show up for an event with matching numbers (at least not until MRT sell a LOT more of their iPT), and even then for it to be a problem (I THINK) they'd have to be in the same heat (though I should check with Doug Haye on that).
But even two people showing up for a big "away" event without an alternate PT can be a major hassle...especially if the venue doesn't have any to sell. I could care less about people buying clones, I just know of a person who HAS sold the clone(s) on. It is definitely a case of buyer beware, but I really hate to think of the poor newbie who buys one and then gets told he can't use it at his first big race.
Ah well...just like no one here in the sticks want lipos in racing (yet) no one seems particularly interested in cloned PT's. So no probs here.
Scottrik