I see lots of red flags. The website looks sleazy. There's no info on staff (so you can't check credentials) or successful campaigns (so you can't check competence).
Beyond that, it looks to me as if this outfit is primarily a press release email blast service. Unless press releases are carefully targeted and followed up on, they are among the the least effective of all book promotion methods. Also, it's likely that the "largest and most up to date media database" consists of email addresses harvested from the Internet. If this company's emails make it past people's junk filters, they'll probably be treated as spam. I got lots of these mass PR things when I was a book reviewer, and I always deleted them.
They also do book trailers. The samples on the site aren't awful, but they're generic and boring. Plus, aren't book trailers pretty much over?
Love your cover, by the way.
- Victoria