Most people (including myself, unfortunately) just go with the standard nutsets and phillips head screws to hold their engine cowling on. What I have found is that it’s such a pain to take off that I rarely ever do.
The top cowl on my Zenith CH750 has about 20 screws in it, and the bottom cowl has another 8 or so. When the screwdriver slips then pain gets scratched, if you over tighten any screws then the fibreglass get all crazed and holding the cowls in place by yourself is a trick all of it’s own.
What this hinge system does is allows you to remove the cowls in less than 40 seconds, and it re-installing takes about 3 minutes. The fitting is much stronger than the screws.
Please note that I always recommend that these be included in the purchase of the FWF. They are not a stock item and freight can be expensive due to the fact that they are 1 m long. Freight is not included in this price.