Mechs are dangerous and finicky... ...not worth the trouble for most people. They're becoming somewhat obsolete at this point. It's a niche form of vaping... ...the vaping equivalent to liking classic cars, film photography, all-analog audio, etc.
Unless you are someone who's willing to sit down for hours at a time nerding-out on batteries/builds, then I wouldn't recommend them. I personally enjoy tinkering with them and appreciate the unique character that mechs as a power source contribute to the vape, but I wouldn't say that it's any better or worse. Regulated is just different... ...and perfectly fine for most people. Unless you're super set on learning how to use a mech safely, I'd probably stick with the reggy. You will be disappointed by the results you get with the mech, although they can be made to perform on the same level as a regulated box.
The biggest advantage to using a mech is durability and simplicity. If you're using it and caring for it properly, there is very little that can fail in a mech - no wiring, no circuit boards, fewer points of contact. It's something small that you can take and knock around. They always just work, for years and years.
There's also the fact that you get raw power, straight from the battery (though this is a double-edged sword, see OBDave's post.) The amount of power you can get for the form factor is magical, but not without its caveats.
They're also just fun to use and build for. Building a coil that performs well on a mech brings its own form of satisfaction, as the difficulty curve is higher when you're building for something that runs at a fixed power level.
Now, if you're interested in learning more about what goes on under the top-cap, then by all means, buy a mech. It will force you to learn all sorts of things about the mechanics behind vaping. I always say that if you can build deliberately and effectively for a single 18650 mech mod, then you can get the performance you want out of any other device out there.
But do make sure you brush up on your ohm's law, battery specs, and so on. Know your mod, know your atties, know your batteries, and know your coils.
And this may just be coming from the sub-ohmer in me, but I don't think mechs are best suited to the power levels you're vaping at. Because of how they get their power and what lowering the power means for the size of the coil/thickness of the wire, low wattage doesn't work out so well. Mechs really shine in the low sub-ohm range, which is unfortunately not something you safely can jump right into on a mech.
Don't mean to discourage you from buying one. I'm just letting you know that there is a significant learning curve. Regulated devices work for you... as in, they do what you tell them to. But with a mech, you've got to work for it. The only limit to what you can get from them is your knowledge of them, but that is to say that you have to know what you're doing pretty well to get anything worthwhile out of them.
the silver is a clone, 
