Having been using sky demon recently in Europe and this week on a trip to Liverpool I can say its extremely helpful with vrps at non familiar airfields.
En route one uses all the usual Nav aids but as soon as you asked to report at somewhere you have never seen before eg Oulton park the iPad was a big success
The same is true for all the N,NE etc French vrps
I have become a bit on an enthusiast for
SD and my iPad at new fields especially for vrps at access points to controlled airspace.