FWIW, I had a set of Teflon/stainless steel braid hoses on a daily driver for at least 20 years with zero issues. I drove this car year 'round. The lines lasted just fine, even without any jacket. No, they were not DOT approved, but they performed perfectly. I mounted them properly, routed like the originals, though I had to make a couple of brackets to hold them in one important place. That was easy for me.
If you don't know what you're doing, don't use them. If you do, I highly recommend them.