I just rely on your routes Chris
I have noticed to be honest but only in the uk not really checked Morocco etc.
I normally plot a route using Olaf etc then play it back in GE checking for that horrible tarmac they keep putting down. If I need a route that doesn't get covered in Olaf, your book etc then I've plotted via GE back into Mapsource.
Bit me last year with a short cut between MA6KM20 north to MH9 KM30 ish. GE looked ok, OSM had a piste but it turned into a goat track about 1km form MH9