Yesterday, Dionne noticed that Costco is carrying the new Roomba 550. Since we had replaced our original Roomba Discovery with a Roomba Scheduler from Costco about 6 months ago, we figured it was time for an upgrade to the new model. After running it for the first time this morning, I’m super impressed with the new features. It is ultra-quiet compared to the older models. It also has "anti-tangle" technology which means that is is less likely to get stuck on cords and tasseled rugs (Mike, you might like this feature!). It also comes with the new Lighthouse/VirtualWall that keeps the Roomba in a particular room until it is considered clean. All in all, I’m very happy with the upgrade.