I've also had the Power Hobby Scorpion/Raptor and the rims cracked on both sets I had after minor bumps...I do mean minor. They're comparable to the Sweeps in weight and look pretty good too but for me the durability was terrible.
I have a set as well. Didn't have that problem. All four were poorly glued. To the extent that I wrote powerhobby and sent photos. They replaced em. But the wheels flex too much for my liking