i had mine done yesterday.
I felt like doing something unique so I added a very twisted (althought not hyper realistic) drop after the lift. It's almsot a double twisting (spinning car, twisting track) vertical dive.
TPR Track Tennis V8.nltrack
good news:
the track is semi smooth and has a good layout
Bad News:
It jsut collapsed killing 1 person, 2 squrrels, and a tree.
Where are the supports man!