The shark is the vacuum I have ever purchased - easy to use, lightweight, flexible enough to be used with or without rollers, full of attachments, etc.  It is particularly easy to empty the bag; and the cord is long enough for each room, even large rooms. Its ability to maneuver around furniture is new to me and I will look for this feature if I ever need to purchase another vacuum.  I compared and researched costlier models before purchasing this and I couldn't be happier.

Pros: Lightweight, maneuverable, long cord.
Cons: I have not found any.