So what is so attractive about mechs given they have such few features? Some of the prices are astronomical!
Hi and welcome to the board. You may be a n00b, but you ask some good questions. For your first,
@petrotech has answered you: the only way to "adjust" wattage on a mech is to change the coil. All mechs and mech-like devices use native battery voltage as the power source, and the "strength" of the vape declines as the battery discharges down from full charge. Regulated mods, OTOH, use some electronic magic to change (regulate, hence the name) the voltage as applied to the coil so you can get whatever watts you set on the machine with any coil so long as the batteries have enough charge left to power the electronics board in the mod. Properly understood, there are two circuits; a power circuit by which the batteries power the board, and a firing circuit by which the board sends power to the coil. While interconnected, they do not impede one another so long, as I said, enough power remains in the batteries to allow the board to do its hocus-pocus.
Broadly, the difference between a mech and a regulated is regulated mods are safer and easier to use, they can vape at a specific strength regardless of battery level (down to cut-off voltage) and nowadays they are (correction, can be; they are not all built with great power) more powerful than any mech not containing an uncomfortable-to-carry amount of batteries. A mech is as simple as simple can be: just a tube or box, some batteries and a switch. They are simpler in construction than a regulated and are far more technically challenging to use. One has to be a coil builder to make one work with any facility and a good coil builder to make one work well. While a mech can be vaped safely-- I've been doing it for years-- they lack all the safety devices nowadays incorporated in a regulated mod and are therefore less safe. (Heed my warning:
it is very easy to get in trouble with a mech if you don't know what you're doing. No fooling.)
Now, as to why anyone would choose one over the other, there are about as many reasons as there are vapers. Some people just want to vape and not fool with it, and these good folks are the regulated mod's natural constituency. Nothing easier to do than screw a pre-fab coil tank loaded with juice on a regulated, set the watts, and vape happy. Some folks-- I hear, can't prove it by me-- actually like vaping up above 200 watts or so. Those folk are also better off with a regulated as well; as are the safety conscious, or perhaps I should say the safety-nervous. Some stick with regulateds as they doubt their ability to undrstand the complex interactions between power, wire and juice necessary to really get the most out of a mech. And more and more, a large variety and combination of reasons.
Some, such as myself, really like mechs. I won't speak for others, but my reasons are:
1) Habit, perhaps: I started with mechs away back when dinosaurs roamed the earth and there were no regulated mods capable of more than 15 watts of power. I need more than that for a satisfying vape.
2) The utter simplicity of them appeals to the engineer in me. Mechs are, in that word so beloved of engineers,
elegant. For some people simplicity isn't an important thing, it's the only important thing. Deal me in on that...
3) I happen to like the variation in vape power as the battery goes south. It adds... something, I dunno... to the experience of vaping.
4) I am a technically competent coil builder and I enjoy the challenge of getting the coil just exactly perfect and making a great vape. I am also not annoyed when I swing and miss and have to rebuild. I
like fiddling with things.
5) And one more thing: they are very beautiful: