I'm in the market for a 18-135 USM as a walk around / kids at the park lens. I see a grey market version on Amazon for $275 less than new USA version. I understand the general ideas and risks for buying grey market but wanted to ask you guys about this particular case. Saving almost half my money is appealing. I've also never needed warranty service on a lens (but never say never right?). But I don't want to do something stupid and waste the other half of my money either.
What would you do?

