I had keylock solex ones, what a pain in the arse. You cant open the bonnet fast and if you want to open while the car is on you have to turn the car off as the key will most likely be on ur key ring.
Lining them up can be interesting as it nearly has to be perfect or they wont. Also its only a little bit of steel holding the bonnet from flying off. Didnt look safe to me, normal bonnet pins are way better, easy to install and you can just buy 2x masterlock padlocks for $12 at sueprcheap for added security if your parking somewhere.
The aero catch lock ones are good, but you have to cut a massive hole in your bonnet and also quite time consuming to fit.
Normal pins ftw! I got mine from Alert Motorsport in Mt Wellington for $45.
Watch out for the crap ones on trademe, I got some and they didnt work properly, kept jamming up etc.