The Viking side and rear windows can be removed and stowed under a flap on the top or just flipped up under the flap on the top.
The Bestop side windows cannot be removed, but, on the other hand, I believe that the top section over the front seats can be rolled back like a sunroof.
I've had a Viking for over two years now and really like it. Quiet, leakproof, absolutely no problems.
There was no design problem with the Viking but an odd manufacturing defect which affected a few of the early tops. This has been fixed for quite a while now.