I have the Famsa one (slightly different model than the one on the OTR site). Bought it off an old forum member. It does work well, expands to a good size and can carry alot of gear. But it is annoying as you nearly have to unzip the bag off to re fill the bike. That and the price is way over the top.
Quality is good and ive used it quiet alot so cant complain as i only paid �45
