Hydrogen peroxide, good or bad?

I've seen hydrogen peroxide get mentioned for a lot of plant cleaning methods, as well as pest management.

Occasionally I'll hear this is harmful to plants, so my question is....is it? I doubt Im going to get a unanimous answer here either. But if you believe either way, will you give a detailed reason as to why?

Bonus points: If you do use it, how do you use it. If you don't, what's your preferred method for sterilization/cleaning of plants/soil.