I don't really get it. If you are using 10 or 12 feet of full t-material, the butt end of the sink tip pulls the tip of the floating skagit head down anyway, so it seems like the same effect. Feels like one of those things that was dreamed up to create another SKU or had too much time to think instead of fish. I'm skeptical, but someone can convince me.
I use the 50/50 for pocket water and boulders (what it was intended for). I also use it for water where a full tip hangs up too much. 50/50 with an unweighted fly and cast more downstream can get you into shallow lip of the tailout. I use the 50/50 a lot with weighted streamers for SRC's.
I try and keep it simple. 10 feet of t-11, and a 50/50 sink tip. Everything else is for people who have a hyper-specific situation, or for people with a pro discount.
Here is Ed Ward talking about how to fish MOW tips. There is a video of him showing the high stick, then drop, but I can't find it.