I wasn't aware of the SKS Longboards, but seeing a couple of pictures here was enough to convince me to try them.

I'm positively impressed by the design and construction, and I think they look pretty good, too. I provided my own M6 screws to take advantage of a couple of available braze-ons for mounting the rear fender.

I haven't ridden in the wet with them yet, but the Longboards provide more coverage (especially the front fender) than the ones I had been using.