Kentucky Honda 11 asked:
"Do they seem to be as effective as actual hand guards?"
Since I've never had "actual" hand guards, it's hard for me to say. Before I bought my NT, I'd had a GL650i Silverwing with the same fairing as the '83 Goldwing. That was followed by a couple of Kawasaki C10 Concours. The Connies had their mirrors located so that they deflected wind and a lot of rain.
My observation about the OEM wind deflectors has been that Honda must have spent some time in wind tunnels perfecting them. They work something like slats on the leading edge of aircraft wings. They manage to keep
most air off your hands and they keep my hands drier than the mirrors of the Connies. I think they do a better job than the big Goldwing on my '83 Silverwing did.
I remember one day when I rode from Ft Morgan to I-25 just east of Loveland to meet some friends. We were going to ride north to Wheatland and meet another friend who was going to ride south from Casper, and then ride to Laramie for lunch. There was a fairly heavy mist and the temperature was about freezing. When I got to the first meeting place, I realized that my boots were covered with ice. Then I realized that the whole front of the fairing was also covered with ice, with the exception of the area over the low beam headlight. What I had thought was just moisture on the windshield was frozen. As we rode north, ice continued to accumulate. It gradually filled in the slot between the wind deflector and the fairing edge and that's when I started getting a little moisture on my hands. But then, we rode through a temperature change and in a matter of seconds, the ice on the wind deflectors was gone.
I guess that Honda was recovering their wind tunnel investment with the $149.99 price that the deflectors originally brought them. They might have recovered more of that investment if they had charged less.