We bought this following a theft of a Micro Scooter (Maxi) from the school bike shed - the words "stable doors" spring to mind! We bought a replacement scooter and didn't really want it to happen again. Equally, we were looking for a lock that is compact and easy to use for a 5 year old on his own. The Cable Lock Microsafe is precisely that.
As some reviewers have suggested, you can thread this through the wheels. However, on the Maxi scooter there is a gap between the chassis and the foot plate (by the front wheels) where the cable fits perfectly. Because the cable is coiled, you can actually leave it attached to the scooter all the time. We intend buying another one for our other child's Micro Scooter (not Maxi) - hopefully we will be able to do similar.
This isn't some sort of high security lock - it is simply a deterrent for a would-be thief (in fairness, I don't think the manufacturers or retailers are suggesting otherwise). I am sure with a small pair of wire cutters you could get through it fairly quickly, but that's not really the point.
I would recommend (indeed have recommended) the Cable Lock Microsafe to others.