I have the quieter Librands - lovely sound, really pretty loud when at revs, but very quiet, woofly and civilised around town and when burbling about. It's a really well-judged sports exhaust, and I'd have it again as it's not antisocially loud in built-up areas, but sounds brilliant when giving the car the beans out on the open road.
Motorway speeds in an Aero, it's not the exhaust that bothers you - drowned out by wind/tyre noise!
