Well I don't know if the aluminum clone is good... it probably is, but I haven't tried this version. It could be the same manufacturer, but that I do not know for sure. But, you are right in that $25 is not much and so you might as well try it if the aluminum appeals to you.
You need to insert the batteries in the same direction, it is a parallel mech mod. If you are careless, you will cause a short that will wreck your batteries and could possibly melt the delrin too. Like any mech, there is no built-in protection against user error. Use good batteries, such as VTC4, VTC5, 25R, HE2, HE4. And, to get a great vape, you need to build your RDAs at fairly low resistance, within reason (use ohms law). Due to the parallel battery configuration, you can safely build very low, but make sure you know what you are doing and are measuring your builds to check for errors.
It is a mech mod, so it is the same concept as the Dimitri. The path for the electrical current is different, though. Basically, the main differences between any mech mod is how much voltage it is able to put out at any given resistance (different mods have different voltage drop), and the way it looks and feels. The switch is different. And the batteries are inserted differently. Dimitri is aluminum only, but the Raptor has a copper option, if that is worthwhile for you.