As RobboRider says, some of the imagery is decidedly old (there are several huge areas of Kuwait, for example, which have been built on for over 15 months which don't feature). I'm not convinced that paying for an upgrade gives you more up to date images - I've just been through the blurb for -Plus, -Pro and -Enterprise and they all seem to offer improved image handling, but no mention of newer/updated pictures.
However, within its limitations it is an attractive, potentially-useful programme.