A plugin like that can help a lot of developers to preview the unions they’re making easier (Well, a bit obvious as it seems to be the objective of this plugin after all)
From the videos (as I didn’t tested yet) the plugin seems to work really well, without any problem.
I would recommend my friends to use it, as it can be really useful for anyone that works with unions, and I’m pretty sure that in the future, this plugin will be a lot mentioned for new developers.