Actually, since you asked, I don't agree with breeding Spiders or any BP with Spider genes, and I don't own one. I don't soap box about Spiders, because I know many, many people enjoy Spiders and Spider crosses. It's just my personal decision.
Don't make the mistake of confusing a mutation with a genetic defect. Someone born with thalidamide type flippers for arms isn't a mutation, they are defective from a genetic standpoint.