I haven't gone up Humevale road (yet) - but I've gone along Whittlesea-Kinglake West Road in both directions. Dave and gozzo left roshea, paul_f and myself "for dead" on the first steep climb - we only saw them when they stopped to wait for us pps:
I've only descended on my hybrid (cos that was just before I put a deposit on my road bike), and I didn't really have to touch the brakes much, as the curves in the road weren't too much.
My claim to fame on that ride is passing Dave (on speed-wobbly TCR) on the downhill ... only for him to mow me down the the straight into a headwind.
The third ATTA Vic Time Trial (on Sunday March 11th) is the Humevale Climb (10 km). So Dave, the challenge is on if we both do the time trial. We'd both be able to test out our new bikes on the uphill AND downhill