We have bunches of the elan lever sets throughout our house, and 4 keyed lock sets, and just changed out another to a lock.  We initially bought a different brand, but some started to sag within weeks so we changed out all of them for the schlage elan.  Now 28 years on, they all work great, and none of them sag.  Reviews and ratings of others seem to all sag after a while, but not these.  More costly than some, but worth every penny.