EPDM basket are rated up to 230 °F. There is anywya a specific silicone based lubricant to be used with copper pipe (Gruvlok Xtreme Lubricant), which they claim capable to withstand temperatures up to 400 °F.
Agree, it works well IF each piece is supported such that there is very little weight on the fittings. It ain't welded pipe, so the joints will not take much of a gravity load. Figure twice the hangers you are used to.
