I finally took my fg out on my favourite 25 mile training loop this weekend. It was my first time taking it off the track, or just cruising along the dead flat MUP. There's a couple of long, steady climbs and 2 descents at 15%, each with a stop light and a busy intersection right at the base.
+1 to everyone who suggested throwing a brake on the bike to regulate downhill speed. I left both brakes on mine when I stripped the derailleurs and built a new back wheel, and I wouldn't feel comfortable without both of them there. I can't imagine trying to slow/stop myself coming down a 1/2 mile 15% grade without at least the front brake.