Sure if someone wants to steal your car bad enough, they'll smash a window, but if u got ur car parked out the front and they smash a window u'll hear it, round locks will detour the theives away. A screwdriver behind the lock aint gonna make any difference between the locks. Just goto make sure u put them in properly. As for the original locks they just stuff up over time aswell, my mates vl doesn't even need a vl key to unlock the door, and u'll find that if u go walking the streets at night with ur vl key and decide to try unlock random vl's ur key will prob unlock 10-15% of them. I agree with dust and crap getting in them, i was stupid enough to unlock my door after being down the beach having a swim :b: got sand in it but it's still good. Only 60-70bucks for them from supercheap for the 3 set. Fuel immobilisor bout 30 bucks, im happy enough with that considering cars don't get stolen that often in rock vegas.
