I used some for the connections from the tank to an external fuel pump, -10 and -6. The -10 was a piece of cake to install; the -6 was a bitch and a half.
I am fortunate enough to have an Earl's factory outlet a few miles away, so after trying 3 times (and having to cut 1" off the hose each time) I took the -6 hoses to them to try and assemble... and even they gave up

(nicely exchanging all the -6 Super Stock parts for Ultra Braided line and fittings).
Turns out that the BLUE line is much easier to work with than the BLACK line in -6 (only), they don't know why.
It can be done with the Blue -6 hose (and all other sizes and colors) very easily, here's what I did -
1. Cut hose to length and install fitting into a vice, barbe end out. Be careful not to crush the fitting!;
2. Stick the hose end in a pot of boiling water for 30 seconds or so;
3. Slide the metal sleeve over the hose end, lube the barbed fitting and hose end well with oil (new motor oil works OK);
4. In one constant steady motion, push the hose end onto the barb, do not stop until the hose is completely covering the fitting.
That's it, you're done.