I've had two Polypro fire hoops crack on me. Polypro is worth it if the hoop in under warranty.
all my polypro seems to crack eventually but I am really rough on my hoops. They have never cracked so hard that they broke though..
One of my friends polypro shattered like glass when it bounced on the ground .
My friend has an HDPE Cosmic LED, the one that folds down into 2 minis. It kinked and cracked after being collapsed into the minis
My roommate's HDPE coil down kinked and cracked after a 2 or 3 years. She's waiting to get fresh tubing now. It took another friend of mine about a year for her polypro to crack/break. With just the two examples though the HDPE seems to last much longer. Everyone else I know has PolyPro,....no complaints yet.
I think the kink and crack comes from trying to coil and twist the HDPE into a smaller circle than intended.
When I bought my LED hoop a few years ago, I initially got HDPE tubing. After a few months of having it, I was a bit out of my mind one night and so into my hooping that I had no idea how hard I was going... until the hoop flew into the wall and the tubing cracked. I sent my hoop in to have the tubing changed and upgraded to polypro. When I got it back, I was sooooo happy I switched to polypro. I've had my hoop for over 2 years and the polypro has never cracked.