I like the top very much, and don't find the smaller glass to be that much of a problem...it's certainly not a problem with the top down.
Some people complain about the visible lines on the defogger of the GAHH top glass, but I don't find them very visible at all on the Robbins top glass, and the material is much nicer than what was on the car orignally (granted, anything new would be nicer than the 14 year old top that was on the car). I changed mine out of necessity because a tear developed in the vinyl window.