One of terrahawks and one of mine had the wire bead snap and rip through the carcass, puncturing the tube. they tyre wouldn't sit on a rim afterwards (long walk home): you can just about see it sticking out in this pic
My second just popped off the rim while riding along a flat, straight bit of road – again the bead had stretched and it now simply will not stay on any rim. If you manage to get it to not pop off before inflating the tube, anything over 20psi just blows it straight off (anything under and it just flops off as soon as you try to ride)
Can't be a dodgy batch either, as I've had mine (sitting unused) for a year, terrahawk only got his a few weeks back.