I'm using Autolock. Same type as below, but older style cross lock key.



Been using it for more than 10 years in my old manual corolla. Car was broken into twice before. Once was to steal coins. That was in IOI Mall open air car park. They would probably would stole the car if they had a parking ticket. Still the auto lock probably deterred them.

The other time was in Puchong Jaya near Proton showroom. The car was nearly driven off as the the ignition key slot was mangled. But car cannot change gear due to the lock in place at clutch pedal. They stole a new UPS battery instead that i had in my car that time.

I am not going to gloat that this thing works. I bought it because my car does not have an alarm system. And it is only RM90 after i used some JUSCO vouchers for it. (Yes it is that long!)

Pros : What i said above.

Cons : It is heavy. It is a hassle to put away because it is about 2 feet in length retracted. Cumbersome to engage and take out. Could pinch your fingers when the locking rod slides down. Metal can rust when powder coating & chrome chips away.

Unmentioned usage : I actually used it to hit a Honda City that was driven by thieves that snatch my customer bag & phone. Grab the lock extend full length to 4 feet, and it is instant bludgeon weapon. Only managed to smash their tiny rear window as they make their escape hastily.

There is a possibility of being impaled by that lock that is in fixed position in the car. I do think that having a removable lock in my car that i have now would also be a projectile that could hurt me or people outside if i was involved in a violent collision.

But then again, you could flag any car on the street to see whats inside their cars, and very likely it has a bunch of unnecessary stuff inside that could injure in an event of a collision.