I've used it 4 times since the 21st, and had only one minor error (placed the destination about 100 yards away from actual location). Otherwise, it works perfectly. I like it much better than the Google Map app.
Finally a poll. So many people complaining about it on the forums, lets see the real results from a straight up poll.
Its OK IMO. I live in the US and its let me down a few times in major cities (Baltimore, NYC and Vegas) but its worked properly more then its let me down. My only gripe is lack of POI's because sometimes I like to just see what's around or on my route. Thankfully I don't have a huge need for public transit.
I think the app itself is kind of featureless but it gets the job done.