On my Shelby CS6 hood, I didn't want hood pins because I wanted a cleaner look. But, I noticed pretty quick that the hood would flex and flutter at highway speeds. Did a little research and it turns out that there are only 2 small aluminum bars for the hood latch bolts to screw into, so it wasn't really reinforced and most of the stress was on the fiberglass.
Needless to say I bought them for piece of mind. Even if the fiberglass was strong enough to hold, i figured in 5 years the fiberglass would be more brittle and could maybe break.
As far as the WMS Stealth hood pins go, definitely check that you have enough clearance under the hood to fit them. I almost got them, but when I emailed WMS they said I needed
20mm (dug up the email) of space between the rad support and the underside of the hood.
To check the clearance, I wadded up some putty and put it in the locations where the pins would have mounted and shut the hood. The hood will squash it and you can measure the thickness. I didn't have enough clearance, so I had to go with the Shelby pins (I've had lots of clearance issues with the underside of that hood, but that's a different thread)
Depending on the look you're going for you could also go with the Aerocatch hood pins