This plugin is great, it allows you to use multiple themes on a single website. I use it to built a demo website for my client, he is very glad to see it.
His website is combination of photography, product selling and personal blog. Because he is a photographer, I need to make it not only good for text but also looks good for showing his photos. I use this plugin to use a great looking theme for showing his photographs, and other theme for showing texts.
The developer (jonradio) is very nice, when I have problem he will fix it quickly. Rated 5 stars and donated.