I went with glass this past spring and absolutely love it!!!!
The top goes down without any issues and looks a lot better in my opinion.
I will say that it does make accessing the engine a little more difficult as there is less room, but its not that bad. I've accessed the engine a few times to change out the cold air intake without any issues. You will need a cable or rope to hold up the glass and be very careful not to break the glass against the roll bar. With the plastic window it would fold in half where as with the glass window it gets blocked by the roll bar when you try to "fold" the fabric to access the engine.
As far as visibility is concerned I do not notice any difference. Yes it is smaller, but you get used to it quickly.
All in all I highly Recommend it!!!!
Hope this helps.
Here is a picture of my baby!!!
