Hi Austria1 - Yes I have Givi Tank Bag with Tanklock system. Some pics of it mounted on the bike are in my gallery. If U want closeups will take some and post 4U.
Can I say that it is a great system, easy to mount the bag, and easy to take off - especially when filling with petrol.
I would say that the only downside is that because it is mounted over the petrol filler, the handlebars do touch the bag on FULL Lock, and any extra handlebar switches fitted can if not properly positioned get in the way. But that is a Slight downside.
On previous bikes I have used a Bagster Tank cover, and Bagster Tank Bag. Which was fine, but at the time I bought my Givi, Bagster were not making a Tank Cover or Tank Bag for the CT.
Get back to me if you want any further info.