A much better result can be obtained be keeping the gel in contact with teeth for longer than 90 minutes. Zoom works significantly better when combined with at home trays also.
I use at home trays but for an extended period using different concentrations of gel at different points to achieve maximum results. Not everyones teeth will go white!
My teeth are very white but I have been whitening them for a while and keep them topped up regularly.
Opalescence toothpaste (available from dentists) is superb at removing stains from tea and coffee. I'd stay away from over the counter stuff which can be abrasive though.
Most whitening gels are very similar, its how they are used that counts
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