I tested it out last night and this morning's commute. The route it suggested seems more direct than the one I've been using. I'll have to try it on my normal commuting bike to see if it's faster/slower than my other route.
The ride home was definitely easier. It was mostly downhill, while my old route home was mostly uphill.
Going to work was a much different story. Google suggested the same route going to work, which doesn't make sense to me. Given that the route was mostly downhill going home, it was mostly uphill going to work. There was some high grade climbs that I'd like to avoid while riding to work. It did feel faster despite the climbing.
It did a good enough job for me to trust using in a pinch. It's definitely better than just trying to guess the route if you don't know the streets. Especially in this area where wondering through random streets can result in some seriously high grade climbing.
I don't know if I'd trust it for suggesting routes in new cities. The route it suggested took me down Bernard which can be a bit sketchy if the hookers are out.
The moment this is available on the iPhone, I think Joel is going to pwnd all of us in the Alleycats

FattyMatt's avatar is shocking.