Can anyone vouch for Superbook.com?

[Dragon Slayer]

I really like Arizona/Baltimore Future in the Super Bowl... Most sites have it around 45/1... Super Book has it at 70/1. I noticed it's not one of MJ Preferred books, but I hate to leave $2500 on the table if someone can let me know this book is legit.

Thanks for any help you can give me.

DS