The OnGuard mechanism is essentially the same as that being used on the best 2006 Kryptonite locks. Both require that the key be fully seated before turning, or the internal discs get misaligned. If the disks are misaligned, it takes ten seconds (with a little practice) the realign them with the tip of the key.

All locks, every brand, will have problems when exposed to rain, road spray, salt, and corrosive chemicals (such as the "air" in states under the rule of the petro-chemical industry). Treating with lubricant from the corner locksmith will prevent problems. If you have neglected to use lube, WD-40 will get the lock working again.

These are NOT "OnGuard problems". These are "owners not reading the instructin manual" problems.