I hate to say how many cheap vacuums I've gone through that just don't work.  This one wasn't that expensive, but is a world of difference.  After putting together, I haven't had to figure out anything.  It just keeps working.  Suction has stayed constant.  It's light weight. It even can be separated from the base to be a hand held to make it easier to get under things and into tight places. 

Pros: No problems. Easy to put together.  Keep working well.
Cons: So far none.