yep, the roof is pretty cool. but the cool thing is basically the little time it takes to close. on the other hand, the light on the court isn't the best as the roof kinda casts weird shadows when it's sunny; you could see that yesterday.
it's a bit like the roof at the commerzbank arena in frankfurt (soccer), where it's also quite irritating to watch matches on tv when the sun is shining. remember the first england match at the world cup? horrible to watch...the shadows looked terrible on the field.
on the other hand: big up our german craftsmanship!