I'm using JIG as a Grid much more than as a gallery. Reason? I found performance to be really zippy and customisable options incredibly thought-through and versatile. I guess with so much options it's bound to have a few option forks that may not be applicable under certain conditions. JIG is incredibly powerful as I could mix styling results with my custom queries to leverage on its render engine for showing my custom Grids. I guess having action/hooks would streamline the job further and I hope you'll be able include that as a feature in future too. Just to add, due to it’s insane versatility (without the usual plugin bloat), I found JIG to be perfect for rendering an extremely wide range of visual content. When combined with custom queries, everything just made sense.