When I first had my new top installed I would never put it in the garage without putting the top up. That lasted for probably the first year or so. Now I'm back to the way it was with the old top, (same as Bjorn) the top is down as long as it isn't raining. In winter storage the top is always up though.
Yes, there are some wrinkels when the top is up but if it is up it must be raining so who cares.
When I see a convertible with a perfect wrinkel free top my first thought is "bet that top never goes down". If that is the case, why buy a convertible?