Halfway through install I realized that the turnpeice shaft on the interior assembly had been put in upside down in the factory, meaning that the lock could not be installed. Right now my opinion of quickset products is pretty low but I am really interested to see how they handle replacement of the defective part. As long as they fix the issue I think the lock should work out well, but I have to wait and see (plus its pretty aggravating taking out the old lock, putting in half of the new lock, and then having to put the old lock right back in)