You don't mention if you have a Mohair or Vinyl roof.
Mine is Mohair and the noise is perfectly tolerable up to and even "slightly" above the speed limit on motorways.
It also seals very well with only the very occasional spit even in heavy rain.
The inner lip seal must be even all across the screen and I have noticed that it can sometimes get caught up on top of the windscreen surround if you do not fit it carefully.
As you are fitting the lift dot fixings check the inner seal as you go along.
