I tried using these tubes in my WTB werewolf's doing fast DH with some rock garden sections. 2 flats on the rear tire on the very first 2 runs. This may be the werewolf's fault. So I took the werewolf off the rear and put on a Specialized Chunder, which is a dual-ply tire. I got 3 runs down with this setup (werewolf in front, Chunder in rear), just fine then on one run pinched both the front and rear flat.
I understand I probably shouldn't have tried the werewolf as a rear tire, but I think this is too many flats.
But they're so cheap, maybe I'll try running the old flat ones around the outside like suggested.