I've been using tippet rings on most of my leaders since spying comments on the forum here about their merits.
Besides being able to vary and replace the length, strength and type of tippet, I've found it useful for adding droppers. This means using a couple of rings if you want two droppers, but personally I get in a bit of a muddle with lots of flies so tend to stick to one or two.
With the tippet rings, I attach the relevant parts using bloodknots (primarily out of laziness in not trying alternatives) but haven't had too much of an issue when using fluoro using Sightfree G3. I make sure to wet the knot before tightening and once tightened down I use my thumb nail to shunt the loops down whilst giving another pull on the tag with my teeth. I leave about 1mm of tag past the knot just in case the knot tightens down further, which does seem to happen on occasion with fluoro.
Just my thoughts!