I visited Magny for the F1 Grand Prix in 2006. Although it's received some critism for it's…read morefacilities, i actually though this was unfair, and the facilities are much better than Silverstone's.
The main problem is the journey to Magny Cours, from the UK it's a bit of a long drive into the middle of nowhere.
During the GP weekend the place was lively, we camped at the circuit and had a good time mixing with other fans from around the world.