[Royal]

I gave it a high rating only because of its simple design, and no wires, leds, electronics or solder joints. and the switch is designed in a way it should last, I cannot see how this switch can fail.

It is not for the newbie, and though it is easily reconfigured for different attys and batteries. Some tweaking is needed because of close tolerance issues. But for me, and I would suggest, just play with it until you find your favorite configuration, then stay with that.

It would be nice if metal spacers were available though, instead of using 0-rings.

But it is nice to have a purchased mod, that I don't need to worry about replacing bad or inferior components right off the bat.

My only dislikes are the atty connectors. They work just fine, but if you happen to over drip, you may find some seepage down on top of the battery. But as long as the user is aware that this could happen it is easy to keep any eye on.
And the 510 atty connector could use a slot or some other method of making easier to remove if it happens to get over tightened. Just another reason why this is not a mod for a noob.

Also, one other observation that was not immediately noticed, and that was that the air flow, particularily on the Joye 510 atty seems to be slightly restricted when compared to the flow and draw when using a standard e-cig battery or a different mod that has the proper slotting for the atty to breathe. This is also noticed on the penstyle as well. Not sure this would make much of a difference on a 901 as it has it's carburetor hole on the side of the atty tube/housing. Don't get me wrong, the attys still draw fine, and the difference in draw resistance may not even be noticed by some.
Perhaps using an atty adaptor on top of these connectors would solve this problem if anyone considers it an issue. In retrospect, this is something I would like to see improved upon as well.

One other thing Mako users may want to keep in mind. Since the switch is made of brass, and brass is a soft metal, it stands to reason that use over time can cause some wear. I use a little lube on the center shaft to keep any possible wear minimized. WD-40 should work fine. I just tried some Hoppes gun oil on mine at it smoothed out the action of the switch nicely.