CastIron....check out the previous posts about inserting the key from alanbikehouston...he's right on. Kryptonite's been using this cylinder in the New York Lock for over 5 years now and there hasn't been much talk of the cylinder issues in that model. Yes, it is different than the round key, where the key needs to be inserted fully into the cylinder before turning. IF the cylinder is slightly misaligned spend a couple of seconds 'wiggling' the key into it. Should be fine.
JohnZ...sorry for your trouble....really...when you get a minute to breathe after the new baby arrives, give our customer service a call and explain your lock situation.
Yes, the new cylinders take a little bit of getting used to, but if anyone else is truly having a functioning issue with the lock they have, give our customer service a call...Koffee, if two locks really aren't working, call us....