I love my Kwikset locks. I had a serious problem of people leaving the house and not locking the door. Now, it auto-relocks 60 seconds after the door closes (HAI logic triggers the relock via door sensor and timer). Like drvnbysound, I have the original first gen, but changing batteries 2-3 times a year is no biggie for me. The lock beeps at you when they get low and you usually still have several days usage before they actually stop working. I'd buy them again.