As a steering lock goes they are probably one of if not THE best.OK they have around long enough for people to know how to get them off.As a deterrent they work wonders for the average snap n cap twocker.I have two and have used them for at least 15 years.I have even borrowed one out and an attempt was made on the car,disklock won .
As long as you dont rely on this as your main security it should be fine.One of my locking mechanisms broke and I mentioned it to a guy on the DL stand at one National day,a few days later new parts arrived through the post foc