I loved the additional worldbuilding and I can't wait to read more of Maggie.

The only drawback I had is that it has been a couple years since I read Trail of Lightning. Unfortunately, Storm of Locusts requires remembering what happened in Trail of Lightning in decent chunks with vague references and no summaries. And I don't remember the details well enough after so many (waves hand at the last two) years. And the story does not quite stand well enough as a stand-alone if you don't remember Trail of Lightning details. It's a choice not to include the summaries or specific refences, but readers should know to either have an excellent recall of the earlier book or read them back-to-back.