Review (4/5): Great product, great results but..
I concur with the rest of the reviews. They do make your teeth whiter (for me i noticed a difference after the first application). Also people stopped me and complemented me on my teeth.
However the things are very hard to put on your teeth. The top ones are easier, but the lower ones are very tiny and often slip off.
It also takes one or two applications for your mouth to get used to them. So make sure have a towel on standy if you intend to use them (they make you salivate)