You will be impressed by the amount of spam with a catch-all account.

I find looking at my gmail spam label to be more depressing than impressive, so I try to avoid looking at it -- which is why I use gmail for my catchall accounts.

I suggested you use gmail for a very good reason there, very good at filtering out spam.

I've found very few places that are good about blocking all of the disposable e-mail domains - I can't recall ever finding a site that blocked all of them.