Good Idea. I think I'll get a set for quick stops if needed and for road trips a cable/chain system.The wheel locks do not go through the frame so a determined thief could remove the wheels from the bike and takejust the frame.
As with most locks they are mostly a deterrent for opportunists, I use them when I'm not going to be leaving my bike on the rack unattended for a long duration like a quick pit stop at the store while headed to the trailhead. When my bike is unattended for longer periods or if i am in an area with a high theft rate, then I supplement with a chain through the frame and locked to the hitch under the bumper.
I get funny looks when I wheel my mountain bike to the lobby of a Marriott.