The Classic is a great starting point, wind will hit you at just below the shoulders. Great for a 90% city riding and 10% highway 60mph riding. Not great at 70mph+ though, you're eating a lot of wind and the next size bigger works better for a 80% city / 20% highway mix. Any more highway riding than that and you better start looking at a batwing faring or the highway wind will be going 10 rounds on you every trip.
Installation is very straightforward, get some metric hex bits for your 1/4" ratchet because this thing doesn't come from the Land of SAE. Feels like it's durable, even the fork clamps which are plastic (glass impregnated nylon??? not sure, wish they would specify because if it IS glass impregnated nylon that's fantastic because that stuff is SUPER durable).
Polycarbonate windscreen itself is excellently made, thick, it'll take a full size rock, I know...
Packaging is fantastic as well, box design leaves almost no chance you'll get a damaged product which is a breath of fresh air in the current world of Chinesium Packaging that I'm accustomed to.
Lets put it this way, I bought the Classic, loved it even though it wasn't tall enough for my mix of highway and city driving, bought the taller one, NO REGRETS, and I'll probably give the Classic to my brother because it's the perfect windscreen for what he's building his most recent bike for.