I've been using the original club now for 6 years, and combined with other layers the various vehicles I've had over that time period, it has proven useful.  I wouldn't depend on this alone, but combined with a good car alarm, and some kill switches makes for a solid theft deterrent.  But, there have been several times when I've only had the club for anti-theft, and I've been fine.  I'm pretty convinced that as a theft deterrent, it still takes about 30 seconds to a minute more for a thief to boost a car with a club than without, and when you're lifting cars that aren't yours, every second is a second that you can get caught so prolly best to move on to some easier pickings.  I've never had any problems removing it from the steering wheel or placing it on there.