Congrats on the pickup.
I really like the Honda tall screen. After my GL1500 with its extra tall Tulsa screen I decided I will not ever look
through another screen. I am 5' 9" and 32" inseam and can see well over the screen by many inches. I'd say it's about even with just below my nose, or just above my chin, somewhere in there. I can see a lot of road up close in front of the bike. My ST1100 had a Rifle screen that I ended up cutting 3" off just so I could see over it, but even then it was still taller than the Honda tall screen on my CTX. As to having any visibility issues... the only time there will be any issue at all is if you let the screen get really really dirty (btdt). And then you will only have an issue seeing the road
JUST in front of the bike. Simple solution... clean the screen.
As to extended warranty... I'll wait on getting anything until I see Honda, or someone, willing to include fully covered replacement of any plastic panel for any reason at any time during the life of the warranty. Otherwise I have no worries about the mechanical parts of this bike since it's mostly brought over from the well proven, thoroughly tested, ST1300 platform.