The reason why I really love the Shark ION Robot Vacuum with Multi-Surface Brush roll & Wi-Fi Connected is that is really works! At first I put it in my Livingroom where it is more clear, thinking it cannot handle upstairs where there is a lot of furniture! Well I was wrong as I put it to work and that is exactly what it did by going into the tight spaces and doing  a super job! Should have bought it ages ago, really wish I had, as it is really great!