My wife and I have bought 5 or 6 roombas over the last several years. We have a 2000sf house, and run the roomba multiple times a day. We run each one so often,

My wife and I have bought 5 or 6 roombas over the last several years. We have a 2000sf house, and run the roomba multiple times a day. We run each one so often, that we generally replace the batteries and other parts in it multiple times until the machine finally dies in some weird manner. Our last one "died" when one of the photodetector sensors went out on it. I looked into fixing it, but it was one of those jobs that required you to take nearly half of the robot apart (and the screws are not all the same, and there were something like 40+ screws to juggle) just to solder in a small phototransistor. Without that part, the roomba just goes in a circle and then stops. Instead, we bought another, and that roomba ended up in my junk pile with the others (I'm slowly building a (broken) roomba army to take over the world - don't tell anyone)...