I would pass it sometimes Simmons signs so bad and so sloppy I wonder if its even worth having the signature.
The fast thing however tends to be a bit of a myth, I have had dozens of in person KISS signatures Paul Stanley often signs at a fairly reasonable pace and I have actually had Gene sign so slow it was almost as if he was drawing. Some of his resemble a scribble quite often. I asked him straight up for his full signature more than once and he has replied that no one would believe it was his.