I have an orbot Vibe , It is a nice machine with a 4 gallon tank. Maneuvers easily and is easy to load in my van without a ramp. However, sometimes, I feel the light head weight and the smaller motor are lacking for cleaning speed. I can easily make up for the smaller tank on the phoenix with extra 2.5 gallon bottles ready to go. So the real question is, can I make better time on long commercial hallways with the Phoenix?