I have tried split focus on the X-T1. I learned photography on Nikon F bodies, so Split Focus is what I'm most accustomed to.
The problem (well for me at least) with Fuji's split focus system is that instead of a piece of ground glass which is more or less ALWAYS in focus, making it clear when you're not properly focused, the Fuji system simulates the effect; the trouble is, of course TTL the EVF is unable to show the split focus area as sharp until you're close to being focused. Maybe my eyes suck, but this solution just didn't work out for me. I couldn't acclimate.
Don't get me wrong, I'm happy there are a variety of options on my X-T1 and in all honesty they aren't BAD...but as many others have said, they just aren't as bang-on reliable as their analog counterparts.