If the engine is cowled, and you think you might fly the plane longer than a month or two, consider a conventional mount.

If you think you might crash and want some energy absorption and expect the crash to not be too bad, the clamp is just the ticket. My guess is it was designed for the newbie who has trouble drilling the 4 holes accurately.

If you can be trusted to get the 4 bolts properly tightened and to keep an eye on them over time, yes, it can be trusted. They're like everything else in our hobby. They work excellently well for those who can work them.