I'm not sure what that kit entails but, a full bow cover is a must for me. I had mine made at the same time I had my bimini made. I can't imagine not having one. While I didn't install mine, I have done similar work in the past. It's not that hard if you take your time.
The air dams are ok but, they cut off the entire bow. With a full cover, you can still access the bow. The kids love to crawl under there on the chilly days and hang out. I feel they also do a better job of keeping the wind/water than the air dams do on those days that turn nasty.