For me it's just the options they have: vanilla, chocolate, or Jamaican fruit cake. Chocolate and vanilla are pretty boring, and I'm a bit wary of the fruit cake since I won't be able to make a site visit and try it before I decide. I haven't really been able to find any reviews of their wedding cakes online, so I'm thinking I'd rather go with a place that I know more about.
Of course, at this point my wedding is about six weeks away (eek!) so I'll probably just go with the Secrets options. I'll let you know how it turns out!