Do Rapid White Express tooth whitening strips work?

[Seekingapony]

Anyone tried them?

Have used the Crest White Strips, they were great. Bit of a commitment though, twice a day for 20-30 mins a time. I did it over the Easter Hols once, no way could I have fit it into my morning routine if we had an early start.

I have tried to find Crest White Strips but they don't seem to sell them in Boots - where do you buy them?

Are the Rapid White ones similar?