These are probably the best value on the market for the style of bumpers, and they're great bumpers so far. Good quality manufacture, everything to good tolerances. They were well packaged (in fact, rather hard to remove). I mostly drop on silencer pads, but they have the light bounce of rubber plates when dropped directly on the floor.
They are slightly (very slightly) thinner than other similar plates- the 25kg plates are the same width as the 45# plates on another set I have, while the 20kg are slightly thinner. No idea if this could actually mean more plates on the bar.
The colors are exactly as shown in the pictures here- which is to say that they are exactly as bright as they look. I would have preferred slightly more muted tones, or maybe some contrast (white lettering, maybe?) but they're picked up enough dust already that they look fine.