I had a MK1 Brabus and that was better on Dual Carriage ways than it was around town IMO, they are a bit fussy to get off the line in stop start traffic with quite a throttle delay but once moving it was great. Was fast enough on A roads, did only 48mpg though and had to use super unleaded.
The Mk 2 I used was much better but the diesel was gutless.
This was my Brabus