I had K-Drive bags on my V-Star 650 for four years and 36,000 km. They held up well. Having the bags easily lockable and removable is an excellent feature. Don't use the handles to carry the bags or they could pull out. They did leak a little, but not too bad for a soft bag. They were also light weight, and held 22 lbs (10 Kg) each. I found that the bottom plastic rest that holds the bag onto the frame was starting to wear after that much mileage though. I expect that you could get replacement parts for them.
K-Drive has raised their price to the point that they are now out of the market in Canada. Not sure why they did this. I paid $649 CDN and they are now nearly $800 CDN. I now have Easy Brackets and Edge 102 saddlebags for less money, and am very pleased.
2010 Speedmaster Black w/ New England White. Air Injection Removed. TTP Breathe, TTP O2 Sensor Kit, TTP Tune 2, DNA Air Filter, Trident Exhaust.