I bought it long ago, at full price, because the WWII era planes I bought needed their own world and what was more fitting than that part of Europe?
The last update last year I think, maybe early this year...did improve it some, compared to what it was since it came out. But, and there's always a but. If you're looking for something detailed outside of the scope of the map's title...Normandy, then you may want to look at The Channel map. It'll give you more of a sense of being in that area I think.
But, again there's that word...there's not a lot of SP things for it yet and there's some pretty decent ones for the Normandy map, so it's still flight worthy. :)