The current run of the HPP Wizards (the lime green ones) are very stable and durable.
I actually have some of the test run ones for the current lime green HPP Wizards. The current run feels like ESP plastic, the test run was more like champ. It also had more of a yellow tint to it and looks just like the '01 CE Aviars and Rocs. Apparently they made 10 of them to try them out. I bought 4 of the 10. I went back to the shop last week to see if they ran any more and nobody even knew where I got mine. Even Dave hasn't seen any like the ones I have. I guess only a few of the guys working back there knew about them. I'm going to try my best not to lose the ones I have. They're super durable. I've been throwing mine for a month and it has seen many trees and rocks and it barely has any nicks on it.
The only problem with the HPP ones is the fact that they DON'T beat in. It's hard to cycle through a putter that takes ages to show any signs of wear.