No mate - not had any issues with the roof. This year will be our third camping season with it and we love it.
The high lift and the 300kg rating of the bedboard mean that 2 adults can easily sleep up there - there's even enough room to lay with your head towards the rear of the van, which negates the risk of your pillow falling off the bedboard in the middle of the night!
When not deployed, it's ultra-stealthy - only those very familiar with the VW camping scene can tell you have a pop-top fitted - but, when raised, it attracts a lot of attention (probably not helped by us having a bright orange canvas) and you get fellow campers asking questions and wanting to take a closer look. Whether you would appreciate such attention, only you will know.