
I have the French IGN Rando CD for the fairly large area around Chamonix, which is identical to the 1:25000 blue maps. The trouble is the mapping software is nowhere near as good as the UK OS maps we all know and love. For starters, the map is a scan, and not of the same digital quality. Also, the GPS aspect is clearly an afterthought just to get the letters GPS on the box, as it is virtually hopeless compared to Memory Map. I'm planning the TMB for this summer and will need to transfer the waypoints to the GPS and then download them into GPSU to write names and route information before transferring back up to the GPS. Also, the maps stop at the French borders, unlike the paper ones. Having said all that, it's better than nothing and is the best you'll get for France. I paid 40 euros at Amazon.fr, so at that price you can't expect too much anyway.
I also have the official OS-equivalent digital maps of Bavaria, which go down partway into the Austrian Alps. This is at 1:50000 and is probably even worse than the French one, as it uses overlays for waypoints. This was 40 euros at Amazon.de and is marginally better than nothing.
What I need is a GPS program which can read these maps, but I haven't found one yet.
You can also get 1:50000 maps of Switzerland, but these cost about 480SFr and I wouldn't want to risk it after the other experiences.
You'd think there would be a market for decent program writers to do a proper job on these foreign maps, but no doubt there are licencing issues.