JUST BUY IT!  I promise you will not be disappointed.  I was shocked (and slightly embarassed)at how much debris and dirt the Shark Ion Robot picked up the first time I used it on my upstairs carpet and I had just vacuumed 2 days before!  It also performed just as well on my hardwood floors and vinyl.  If using with the app you can start it in the afternoon and come home to a freshly vacuumed home.  It has provided me with such joy! It allows me to come home in a much better mood and I can spend more time with my family.