I used to use oven cleaner, before I heard of SuperClean. The biggest drawback to oven cleaner is that it is a once-and-done product, you really can't use a batch of it more than once, once you've sprayed it. That, and it's a lot more caustic than SuperClean; you really need to use it in a well-ventilated space and wear gloves (though many probably do not). It's odd, because an active ingredient in both products is lye. But SC isn't nearly as caustic as oven cleaners.
It's still a good idea to have ventilation when using it, too, though I don't always do that.