I finally got my front air suspension fork installed today- a big thank you to bobn4burton for finding the parts necessary! The only addition to his install procedure that I would include is to purchase a star nut and screw to install into the fork stem. The folding handlebar stem assembly has a fitted spacer/washer that the screw goes through and pulls the stem down to the fork. After tensioning that screw the two allen cap screws on the side can be tightened to clamp the handlebar stem down tight.
Regarding function, I think the fork is absolutely awesome! I can fly down trails that would have jarred the heck out of me before, and even riding on the street is much smoother. I lowered the recommended pressure in the fork to make it less firm. By the way, you also need to order a special pump to adjust the pressure, I spent about $34 for the pump as well as a star nut and screw from Amazon.
The only negative for me about the front suspension fork is that I preferred having the front fender both in looks and function. I think the fender added a traditional appearance, especially with my own upright/Danish style biking form. It also protected both me an the bike frame from mud and water. There are little mud flap things that can be attached to the upper fork but they look more at home on dirt bikes than these bikes.
If I was to remove both fenders and the rear rack (as others have done) the bike has a great stripped down look, but I for one can’t live without the rack. I am going to leave the rear alone for now but I have some ideas for the future.
All things considered the suspension fork is a great, great upgrade, especially in combination with the Suntour NCX seat post. I like it so much that if I ever were to ever replace this bike, I would not even consider one that had no suspension.