Without seeing specifically the old vents, it is difficult to comment on them. If you currently have 7 of them I'm guessing they are the older smaller vents.
If they remove the older vents, make sure they properly install roof sheathing over the holes.....!!
Personally I like the ridge vents, as they are at the topmost portion of the home and give more square inches of ventilation. This of course assumes that you have enough ridge to have the proper amount of venting. If you have a gable roof this should not be a problem. Some hip roofs would not have enough ridge to have ridge vents and then need below ridge, "saucer type" vents.
Hope that helps!
Frank
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Florida licensed Home Inspector #HI688. (352) 250-7818
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