Con: They look more like plastic (which they are) in person than in the picture. The black looks almost matte finish/powder-coated in the pictures but they are definitely glossy in person.
Pros: 
They are a good size for my purposes (hanging his and hers bath poufs in the shower stall without a permanent fixture)
The suction is really tight because after you press the cup into the tile, you screw (righty-tighty) the nobs on the front creating a more secure suction.