No, haven't used them. However, I've worked a fair amount with UHMW-PE, making skids and liners for my tractor mount snow blower. The material cuts and machines with wood working saws and tools. It machines easily on lathe, mill and drill press etc. It heat bends with heat gun at around 200 degrees (it'll start turning translucent when ready to bend and it must be held in position until cooled a bit. Since the material is not inexpensive, it's a good idea to make initial patterns from cardboard or whatever.
UHMW advantages. Mechanically the strongest plastic. Impact resistant (1" will stop a .45 ACP round), slicker than snake snot on a flat rock (a little less slippery than Teflon, but a lot stronger).