The GTS screen is 6 inch high 2 inch less than the GT. They were same price £327 in March 2016.
I went for the GT as it provides protection for your hand. I can just see over the top or round it. At above 40mph the rain seems to track horizontally across it rather than over the top.
It was hard to find sealant for it as Fairbourne could not recommend any. I used Unibond HA6 as its OK with polycarbon. Its sold as fishtank glue/sealant.

Tim