I have not used the type you are talking about, but even bolt on tabs give you much more surface area in the back were you need it. In the event you are having trouble getting up on a plane, or if you are having trouble staying up and or porposing, they can be a huge advantage. On the other hand if your boat is riding well, then you probably don't need them.
Where they are a big help is in very skinny water, being they not only help you stay up well. They will also pop up much faster and not dig as much causing you to hit bottom or not get up at all.
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Eat, Sleep, Hunt and Fish (The Devil is in the details)
Dan Duncan