I have bought 3 books from kellyssuperheroes over the past 7 months and I will say that he is really easy to deal with.
In two instances, the books I received had a couple of defects that werent appearant from the scans. In both of the instances, he readily accepted the returns and refunded my money. No questions asked; no hassles.
He also indicates (through correspondence) that he guarantees his unrestored books against resto from CGC or a professional resto analyst. I never sent the book I kept to CGC so cant speak to resto, but I dont have reason to doubt that he would not apply the guarantee.