I've finally had some "bag time" with the Tangent. I haven't checked in on this thread in a while, so I may be repeating some thoughts.
I was kind of disappointed in the disc at first...the problem for me was, I was expecting an "understable midrange," like a Comet/Fuse. That's just not what this disc is, for me anyway.
Honestly, the best description for how it works for me is "neutral/stable putter on steroids."
As I've gotten the idea of what it was "supposed" to do out of my head, I'm finding it useful as crap. Predictable for all sorts of approach shots, especially higher lines, a la a putter. But sneaky long at times. It feels putterish, but some shots, I've been blowing by, where I should've thrown an actual putter.
But, the only way I get any significant turn out of one is to power-grip it, and throw at 85% + in a field. (I only use the power grip on drivers, and will fan grip slower driver molds at times, shot depending.) It'll hold a line for sure, powered down, but not as well as a Fuse. And it seems to stubbornly refuse to roll over at all.
Maybe it'll change some once it gets worn in a bit more.