First, we're assuming that this is Danny/comickeys/robojo. Several of us assume this because these appear the same type of books as comickeys and robojo used to list.
Yes, you are correct, this person has 100% feedback rating. Also, as some others have attested to and I can attest to myself, having dealt with robojo, he responds promptly and is perfectly willing to refund your money. In my case (and I had already bought several auctions before I realized who robojo was), I bought 4 books and returned 3. The 3 I returned were along the lines of advertised as 9.4 or 9.2, but then upon grading were only 8.0 or so. Plus, he didn't actually refund my money, he just gave me credit towards future purchases.
The big issue is selling books as high grade when they are actually several grades lower than advertised. They look great, but aren't as high a grade as advertised, realizing a much higher sell price for the seller than if he listed them at their actual grade. The question is, is he overgrading on purpose to scam unsuspecting customers (while freely refunding for those customers that do call him on the grading) or is he just an over objective grader? It seems the former is more likely with his ability to spot resto and the sheer amount of high grade books that move through those user names.
Also, this person is in the same part (same town?) as comickeys and robojo further bringing them under suspicion. This person (Danny, most likely) used to sell the comics without listing resto and again, would make a lot of money on the people who never double checked for resto or who never sent their books to CGC. We don't want to support a scammer who has done a lot of damage to the comic industry.
As a person who was duped by Dupcak, as Comic-Keys (Doc Koos), about 15 years ago all I can say is Amen. The auctions have the same style, wording, pictures, etc. of Comic-Keys/ Robojo.