Brion Toss: great video. Neat tool. I want one, but I've never been able to justify the cost since I already have Samson fids and a pusher.
I find that I only ever splice single braid high tech line on a cat (since double braid lines are oversized for hand holding , knots are fine).
I use vectran single braid because it is so easy to splice you can do it without any tools except packing tape and shishkabob skewers. However, learn to make a *locking* eye splice like in the attachment. Some (if not all) line vendors no longer recommend non-locking splices as they have a record of failing. Samson has instructions online.