Brake energy limits are usually not a big problem. The rule is: if the brake temperature indication is < 160 deg C before takeoff you don't even need to hit the books. On a long runway you simply use idle reverse and that will slow down the plane quite a bit.
As I am not familiar with the cost-side (maintenance) of the aircraft I cannot tell you about it, sorry. I can tell you, though, that the F2000EX EASy is quite economic: FL400 M0.83 costs you about 1800lbs of fuel per hour, which is really good for this category of aircraft. My record flying-time is exactly 9 hours with LRC thrust. At full steam you can probably fly it for about 7 hours.