Asymmetric tyres are usually louder than say directional, but I haven't noticed Vredesteins to be exceptionally loud. Depends what you're used to, but as you say, you don't have much to compare them to!
Put two new 225/40/18 sessantas on the front in november and have found the grip to be great,the problem is the tyre noise is terrible it is just as bad as the dunlop sport max I had previously. The year before I replaced the rears with continental sport contact 3 which have been fine.m