Too much to quote...
One of those clones has an aluminum body, and aluminum threading. That's gonna strip out real fast. The bagua clone is not right at all, it's supposed to use 14xxx size batteries not 18xxx. I would totally get one if it was the smaller size.
I just sanded the contacts on my new Natural and put a little no-ox-id on all the parts. I think I found the only pinky button mech I'll ever want. I'm not 100% certain though since I haven't done a v-drop test, I'm waiting for my testing battery to charge. After a little sanding there was quite a difference in perceived power, and not a hint of warmth from the battery or switch.
I would watch Todd's review, but I already got burned on one that he reviewed and recommended. Not physically burned, but that could have happened. I'm not buying anything new to the market again. I want to see what happens after a few months of people using it, that's when the flaws appear.
I only do voltage drop tests to compare things I have to each other. Test conditions will change drastically from user to user, just a little info I picked up recently. I don't mean to come off as a snob, I'm just trying to gauge the items in front of me. It might help me figure out how to build my own, and which design mistakes to avoid.