The perpetual movement was originally designed to be compact for the ultra slim so I wonder if it is up to a more sporting use case unmodified. For example when Lange launched the Odysseus the movement gained a full balance bridge. When MB&F launched the evo/sports model of their perpetual, they add some spring/shock mounting for the movement. As far as I can tell the JLC movement comes over pretty much the same. It's nice since it keeps the watch slim compared to something like an IWC perpetual, I only wonder if it would also have benefitted from a little beefing up for reliability / durability.