Did my first ride in this morning. Pwned by the Custis trail. That was the bad news. Worse still, I was pwned going the easy way.
I never found the downhill to be terribly difficult, just pedal like crazy going down, get up to max speed at the bottom and you can drive up to the top fueled by momentum and the downhill speed you gained. It would be a lot more difficult however if there was heavy traffic and one were unable to get a lot of speed going.