Swapped out the Softopper for a SnugTop Rebel with Yakima tracks just before the holidays. I opted for dual sliding windows with pet screens since this seemed to provide the greatest ventilation possible (otherwise would have opted for the windoors). Added the Yakima load bars for a trip up to Vancouver, BC to visit family and do some downhill. Very happy with the SnugTop, except that a couple of bulblets from the top rear brake light are not working. Will look into getting this fixed soon.
EDIT: If anyone is interested in the Softopper, please PM me. I'm willing to sell it for half off the new price. It's like new and less than a year old.