We saw how the last one of these lawsuits worked out a while back...I assume it's sort of frivolous, but you never know.
From what little I read them talking about it on Facebook it sounded like their whole case is based on. They looked up a whole bunch of comparisons over a couple of day.period. That just sounds to me like they were trying to figure out all the areas that their competitor had mistakes in their software.
I can't think of any law that prohibits a competitor from testing your service for how your process works, good or bad.