I watched a few videos, and it would seem that the toughest are inside curves, not so much outside curves. With a tight outside corner, I've seen many at 90, but I knocked a bit off mine, just enough to soften the corner... I will still be notching, using a lil heat, and pulling it tightly, which will hopefully keep that corner nice. I've seen others run into problems on inside curves, like where the sides transition to the marquee area, and they realized they should have made it a curved corner as the T-Mold sits a bit nicer. Not sure the radius, but I myself will sacrifice a few feet of T-Mold so I can do a quick practice run... better than finding out 10ft into the strip that something be wrong.
Hope that made sense.