worked great for the first 2 months (for the price) - the only problem i had most of the time was it didn't go back to the dock, it unless there are some obstacles somewhere else on his way back. Now the right side spinner will not rotate. Since the slingshot on the right side stops working, vacuuming dust from the right side is not effective. The next day it started making a lot of noise like something is stuck but everything is clean inside and out.