Everyone will have an opinion on this subject, much of it hearsay and horror stories that have been told and retold.
2 issues are the ends and dirt between the PTFE tube and ss sheath
Some reading for you
from an NSX board but good
StopTech
I use them, Never had an issue w/ them. I like the 4 layer STOPFLEX® hose. It starts with a Teflon PTFE core which is wrapped first in a Kevlar braid, followed by an elastomer barrier and then by the outer stainless steel braid. also available with a final coat of clear vinyl for a great look and easy clean up.
But Goodridge and Stoptech also have superior products.