Seriously thinking about buying the T-fal Perfection set with vented tops to eliminate all the boil-overs I have with my electric cooktop. Does anyone have this set? How do you like it? Do the vented tops only come with specific size sets? (I've seen 9 pc sets in local stores but no vented tops). Can this set be used with metal utensils? And what is the difference between non-stick Perfection outside and inside vs Perfection hard-enamel? Any pros or cons on T-fal cookware and which set is the best would be greatly appreciated.