I had one robot vacuum that just did not perform to expectation or advertisement. 
I have other Shark vacuums, including the Rocket, and have always experienced great performance from them!!
Shark Matrix did not disappoint me!!  I followed the Quick Start guide because I was eager to try it.  After charging, I began the robot. The navigation is the main appeal to me! No spots missed; it mapped the living room floor and moved in a precise grid, did not go in random directions and avoided obstacles. The cleaning action is strong; two furry dogs plus grandkids with crumbs put this vacuum to the test and it passed my standards!!  
To me, this Shark Matrix vacuum performs as advertised and to my expectations! Very pleased!