I'd rather have the consistency of voltage regulated mods and the ease of replacing it for $20.00. Also, as I use box mods, they can't "go boom", I can use protected batteries, and get more mAh out of em. The voltage regulator has short circuit protection on top of that.
Long term maintenance of all mech mods is still necessary. So if I went that route I'd have to order 5 of everything just to make sure I had spare parts when a mom-and-pop-pv-shop one-off goes out of business. So...the argument that all-mech is better fails me, I guess. I know arcing will make the button fail eventually since they run all power through it. Not to mention the connector wearing out.
So I'd rather have the options/features and replace a $20 or $30 dollar e-cig once a year. Then I'm staying current too. Of course, you can spend more, but I don't.
Whatever you have now...give it 3 years...you probably won't be using it.
EDIT: Plus...(and this is totally personal preference)...I hate, hate, hate bottom button mods. Not all mech-mods are bottom button, but enough are that I would have limited options.