Normally acquires satellites in seconds (unless I land half way across the country). Speed limits are correct 95% of the time. I almost always know about traffic problems before I get to them.
I had to go in and delete foreign languages to free up space for map updates. Very easy to do. Google it.
I've been very happy with this unit. I had problems initially (random restarts, wouldn't connect to computer), but system updates seem to have taken all of the bugs out and it has worked great over the last 10 months.