I have used it a bit; it's very interesting.
- Does a great job showing local bike paths and bike lanes, which previously were not integrated into Google maps
- Seems to have a high preference to *avoid* steep hills. So if you like riding longer distances to avoid hills, it's good.
- In rural areas, it seems to have a high preference for unpaved roads. If you are using it to plot a long ride in the Midwest, for example, it seems to want to take you down dirt/sand roads, instead of sticking to paved highways. This is neither good nor bad -- I think it's *very* interesting as previously none of the online mapping tools that I have seen would take you down dirt roads without a lot of manual work on the user's part. On the other hand, I think most touring cyclists would prefer to stick to paved roads. It will still do that, but you have to tell it you're traveling by car.
- I noticed that in some areas in our region it guided me down some forest service roads that I know are closed to any kind of traffic.
It's a great tool, and will get better over time, I'm sure.