[pvg]

The blue is slightly too vibrant also. You want to be careful about the saturation of your colors. Vibrant/Saturated colors are subconsciously distracting and unprofessional.

This is completely subjective though. To me, for instance, We Pay's current webpage looks like a site I might use for the scenarios described in the NYT article, like a way to collect payment among a group of friends. Your mock-up looks like the site of a bank or mutual fund, which is exactly not the sort of site that comes to mind for the purpose. Again, this is completely subjective - I just don't think there is any way to justify something as vague as 'vibrant is unprofessional'.