In a densely populated country with complex airspace, I fly a 450 kg microlight, disallowed in controlled airspace. Monday to Friday my options are very limited, but in the weekends much more is possible. And it is nice to have other countries very near - even at 75 kts TAS, I have France, Germany and Luxembourg and the Netherlands within two hour's flying, at most. The nice thing is the "French style" ultralight fields in Southern Belgium, less nice is I can never fly legally above 4500 AMSL - and neither have I, as yet. Will have to take a trip into France for that.