Hi leathers,
Just saw your post so thought i would chip in. I have had my sw motech bags on for more than 1000km now and love them - don't notice they are there. They took 20 mins to fit - easy. Only thing is that they are not waterproof obviously and the opening on top is not huge. I have done a couple of weekends away using only the bags, not even extended, no tankbag or ruck sack and they are big enough for me but i travel very light. I generally don't like the look of any luggage on any bike but i actually think these look great.
i put some info on the crossrunner luggage poll thread.
Hope that helps.
Hetfield