I have this bonnet dryer... I used to use it for DCing my hair.... It has a hot spot directly where the tube attaches to the bonnet... I wouldn't recommend spending $50 on it... it's totally not worth that to me. I upgraded to a salon dryer from Salons R Us.
ETA... I have no idea why it's $50, I think it was about $25/$30 when I got it YEARS ago! There are better options out there for $50!!!