I have both the Zega pro and Kriega systems along with the KTM tank bag.
Granted at just a little over 1500 miles, 3 naps and 1 clutch I'm still pretty wet behind the ears but so far I'm very happy with the set up. By using the Kriega drypacks I'm able to haul all the important stuff like tools,tubes, first aid and riding gear for different climate changes whether I'm taking the hard cases or not and the one time I did get stuck in the mud without the panniers I was able to leave the bike and wade out with drypacks on my back and tank bag in hand so all the expensive stuff wasn't left behind.
2013 KTM 690 (Thanks FLHRCI Buyer!
2011 990 Adventure Dakar (Thank you Honey!)
2010 Aprilia RSV4 Factory
2010 Ducati 1198S