The weight of the appliance shouldn't be a lot of as this may cause a difficulty in moving it from one place to another.
Wet or damp suction can cause a solid build up, which subsequently can slow down (or in extreme cases block) air flow. As it might cause you to find out how to produce use of it in any conditions available.
Sometimes probably the most important consideration for some may be if the electric cord retracts on its or not. Dynamic, Ergonomic, Slim and Looks Great!