Easy to mount and take off.  Locking mechanism turns smoothly and will engage/rengage quickly.  Keys cannot be duplicated by local locksmith so you have to be careful with the two that you get.  Solid construction with a heavy feel.  Unknown effectiveness on theft deterrance.  I figure it forces the thief to cut the steering wheel adding 10 seconds to his job.  My insurance claims adjuster and local police recommended that it be used in conjunction with other devices and not the sole means of theft deterrance.