As the plugin's author, I may have a blind spot, but... as far as I know, the plugin works.
Great for placing images when you know the dimensions you want, but need it to be responsively scaled and you don't want to crop every image you place. I wrote it to save myself time and make image switch easier for clients (who don't necessarily always have an editing program or the time to crop things.)
Let me know if you run into trouble in the support area. I'll do my best to respond.