-No vibrations at any speed and have been upwards of 170kph
-With the brackets that it came with there is no side to side movement at all once everything is tightened down properly. It doesn't come with any installation instructions so you just use your best judgement on the torques.
-It works brilliantly! I commute daily on the bike and the winters here on the West coast of Canada are VERY wet. It Keeps 99% of the dirt and road grit confined to under the seat. No more mud streaks up my backside or on the passenger seat.
-As for the license plate mount, that was what it came with from my dealer. Yours will most likely be different due to European requirements.
I know a few of the inmates here have chirped about it looking like the Batmobile, but it works fantastic and if you are able to do any composite work with fiberglass you can always make a mould and modify the looks to suit yourself. Personally, I'm going to find a Batman emblem and mount that on there
If you want any more photos or have more questions, feel free to ask.