I have used Shark vacuums for over 10 years.  I currently have a Shark Navigator Lift Away and I love it.  Some days I don't feel like cords.  This is why the Shark Vertex Lift Away appealed to me.  It is smaller and easy to maneuver.  I like the silicone fins.  I live in a dusty dry climate and this works great on my hard surface floors.  I am impressed that this vacuum has a digital display of the battery life.  
Another plus for me is that you don't have to attach this to a wall to charge like one my mother had in the past.  I am currently renting while waiting on a house to be built and I can't put holes in the wall to hang up a vacuum.  The canister doesn't hold as much dirt as my other Shark Vacuum but it is so easy to empty that it is a non issue for me. Another great product by Shark.