I have been using SkyDemon for both flight planning and navigation in my helicopter now for about 18 months. It's simple, intuitive and if you are unsure of anything I have found that SD's tech support very helpful.
Something worth bearing in mind is that once you have paid for the initial subscription then you can access as many of the maps as you wish and any map updates throughout the year come through automatically at no additional cost.
Filing a VFR Flight Plan takes seconds and GAR submission not too difficult either.
BTW, for flying in France try the FREE App iVAC which gives details of all French airfields. It works either on or offline and is updated monthly. All the data comes from the French AIP. Text is in French and English.