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The hardtop is definitely worth having. It's like having two different cars.
Removal and installation are easy with help from a friend, or with a hoist (see picture below). The hoist I have is called a Harken Hoister. I bought mine from West Marine for $99 it's designed to hold 90 lbs they make one that holds 60 lbs for $89 (I only got the 90lb because it was in stock and they gave me a discount from $110).
Head room is about the same, or maybe a little less than with the softtop, because of the head liner in the hardtop.
Yes, the hardtop has a defroster.
I keep the hardtop on during the week to protect the softtop from the sun. I take it off on the weekends if the weather is nice. My softtop looks like new after 11 months. I would recommend not putting the top down and the hardtop on if the soft top is wet or very dirty.
I only use my S on occasions, and I wish I had not have gotten the H/T. If the weather is not nice, it is in the garage anyway. If I were using it as a daily driver then I believe it would be good to have. Kinda defeats the purpose of having a convertible.