I have one and love it. (Soulpad 4m) we have never had a problem, once the tent is dry and flat we fold it in half and leave it for about 5 mins and the top side is then normally dry, and keep doing this until it is folded. Occasionally we dry off the last spots with a tea towel but it has never been an issue.
the tent is fab, easy to put up and you can unzip the windows to get a breeze through on a hot day. (of which this summer there were loads )