Gripple Hangers and Seismic?

Happy 2025, tinners of the internet! Hope that your break was restful!!

I was hoping to get some feedback from folks who have used/do use Gripple wire hangers for ductwork, and more specifically, for seismic restraint. I'm contemplating using them for an upcoming project. The materials costs are high, and I can't use the seismic designers that I normally use, as they are unfamiliar with the product. The design costs will be higher, the materials costs will be higher, but they always go back to the significant labour savings.

What are your experiences with this product? We've got a pretty big project, with lots of large ductwork, so it's not just a bunch of spiral runouts to diffusers that we're looking dealing with here.