For what you're using it for BrownOut it sounds ideal, it's a bit pricey, but for your needs it seems just about perfect. You could do whole bundles of the size branches you're talking about. If you're using 4 cords of wood a year for home heating sure it's a toy, but not for someone that wants impromptu camp fires every couple weeks. It's a tool that fills a niche.
Personally I would just lay all the branches you're talking about in a line parallel up to the depth of the chainsaw blade you have, bind them together and then you can cut them safely just like you would a larger trunk. Don't think 'one at a time' find out how to bundle what you have so that the tools you already have can work. I don't really see the need for something like this personally, you can think your way around the problem, but if you have the discretionary income then it's fine. For the price I think it's an overly specifically designed electric chainsaw. Depends on what you want to spend your money on, and how much time it will eventually save you.