Got to throw my Opto Fuse on a bunch of holes last night. Usually I field test any disc before taking it out the course, but I went for it.
I can't say that I find it stable enough to be a standalone midrange, but it definitely lives up to its reputation as a beautiful anhyzer disc. It held those lines as well as anything I've ever thrown, and certainly has glide to spare. It has virtually no will to fight its way out of even the slightest anhyzer angle. When thrown flat it would cruise for about a hundred and fifty feet and then start making a slow right turn. I didn't find its HSS to be all that awesome. But actually I wouldn't want it to be very HSS, because then it would just basically overlap a Buzzz. When thrown hard with a little hyzer, it would immediately flip up flat and fly for about 200 ft before it started its slow right hand turn. When thrown with moderate hyzer, it flipped up flat and came down completely straight. I also was giving the disc quite a bit of snap, especially when I got more used to it, and it can take it without flipping. It stays in control.
This is based on a rather flat opto Fuse. I bought 2 of them, and the other has slightly more dome to it.
In the end, I'm glad I bought a couple of them. I'm rocking a Fuse, a Buzzz, and a Wasp, which covers my whole range of stability needs.
So I would strongly recommend this disc to anyone who throws Buzzzes as their main midrange, as I do.