I got a plastic one just a week ago. It's all I've used,
vaping all day with an 1.8 ohm Vivi mini. Battery last about 15 hrs. with constant use. The 510 connector is not very stable and my
tank will tilt a bit when lightly pushed on. The on-off button has held up but I feel that it will be a problem with prolonged use. No frills, $20, probably get a couple of months out of it. I feel as though I got my moneys' worth.