When traversing an intersection with odd angles often the voice prompt will say something like "slight right" for the road I think of as straight ahead, or vice versa. A glance at the map clears these up.

Mine did that a couple of times even in the short route on which I tried it out. I didn't have trouble understanding what was meant, because the configuration of the intersections made only one interpretation sensible. I can see how that might not be true in all cases, but I'm not sure the occasional disambiguation is worth the distraction of a visible moving map display.

There's one road the gps says "take exit 36" then at the last possible second it says "keep left" which is exit 35 (they share an exit ramp).