do they really last longer? is there special handling? any good deals?

They do take a LOT more heat and abuse...what I DON'T like about them is that they have no memory, so if you remove them and put them back, they are loose. In face after you've run the motor a bit, if you move the pipe around a bit it gets loose. Personally I only use them when I absolutely have to. ie: on pipes that just eat up regular viton Orings because of bad design.

A good flange should not eat up the Viton Orings. Just my opinion.

Best source I know for the Teflons is www.mcmaster.com

thanks for the help,again!