Not too bad for the price
Astro, Thats pretty cool for the price. If you priced a professional brand hydraulic crimper along with a complete set of dies, the price would give you a stroke. It appears the dies are cheap aluminum, if so, they will have a limited lifespan.
I agree with BB427 that a properly done mechanical crimp is perfectly acceptable. The Greenlee and Burndy adjustable mechanical crimpers are a lifetime tool, but because of that, you have to hunt to find one cheap.
Also, I usually bite my tongue when I read about guys soldering all their connections. Its simply a waste of time when high quality compression connectors, properly installed, are every bit as good. Soldering connections has it place on devices designed to be soldered, but 99.99% of automotive electrical connections only need crimp type connections.