But they do let you climb like a spider. Once per day, when it's narratively awesome for you to do so, but they do.Then the Boots of Spider Climbing name would be freed up for something that actually let a character stick to a wall like a spider.
I'm glad that Magic no longer trumps Skill in D&D. If your Wizard wants to cling to the walls all day long, he can spend the feat to get the most out of his spider climbing.