Yeah that's self cal. You shouldn't ever see it, though it's ok if you see it once every few months (after owning it for a few months). If it starts doing it every day, then there is a problem.
The blue is really nice, but if I was gonna spend the extra money, I'd probably get a v1. Actually I might would get a v1 over the x50 if I had to do it over again, just because of the problems my buddy's has had and the v1 has better laser detection.
