They're heavy Hugh, i've got some on my car, they are a good track rim if you don't care about shaving that second or whatever off you're time and just having fun.
I wouldn't go hitting ripple strips with them, they are a cheap casting with alot of material (hence the weight) and love to crack.
But I wasn't going to do any of that shit with them anyway and they've been fine for me, even after the shittiest potholes around here