I know that they are the big "thing" with a lot of the clinicians and some trainers these days, so I gave it a try for a while. I found out real quick, fast, and in a hurry that I thoroughly dislike that combination. It may just be me, but it made the bit feel so unbalanced in my hands and I felt like I needed to keep more pressure than really necessary to prevent the reins from flopping around and bumping the bit at any gait faster than the walk. Give me a nice set of leather split reins any day.
Anyway, what do you use on your snaffle's and why?