Onguard's cylinder is both a blessing and a curse. Its a double-sided Abloy derivative (think its from Abus), and has the advantages of not having any springs to worry about, and no insertion force. However it is a pain when the detainer discs get out of line so you have to wiggle the key to get them lined up. Having a lock that can't be Bic Penned or bumped is worth the hassle for me though. Someone breaks the lock, I may have a chance of getting an insurance claim in. Someone picks the lock leaving no trace, there is no way an American insurance company would accept the claim. The nice thing, one can use a decent lock lubricant (avoid dry graphite lube) with these locks periodically, and the lock should work without issue for a good while. However, this depends on climate.