How important is a glass rear window?

[CraigM]

I don't mind the plastic rear window. Never done the chop, although window was replaced a couple years before I got it, so maybe it's still soft enough to not be an issue.
As far as visibility - not much room between the roll hoops anyways.
Only drawback to me is that I've heard lowering it in very cold weather is bad for it. I don't lower it when it's in the 30s, but haven't had any issues yet dropping it in the 40s.

But, the glass cars have other features that may also be important to you (cup holders, glovebox, non-amber headlights -- not sure on specific years for all those), so those may all add up.