I totally agree with the hex screws, and lack of a magnets. Mine came with both hex and phillips screws. I did the 165 watt upgrade and the ohm meter is spot on to .01. (more accurate than my RBA tester) I took it to a buddy who checked it on his fluke, and a much more accurate 4 wire resistance tester used for instrumentation. The battery springs are terrible as they will tear up the covering on the batteries (if you aren't careful). Another problem I found is a nick in the positive wire leading to the battery. Overall I just don't care for it. It is too big for me, and totally un-necessary for the type vaping I am doing. I rarely drip any more, I don't use RTA's any more, and I very seldom go over 15 - 16 watts. It is fun to use though. My nephew came in on leave over the holidays and it was fun to watch him try to hit it maxed out with a .33 ohm dual coil setup on it...lol