I keep reading and hearing from Youtube vids, that some of the older ego twists had some issues with leaking, etc. So, when I buy, how do I know which one to get? I have no problem buying an older one if you guys can confirm they work just fine, and it saves me a bit of coin; but if the latest version has an advantage, I'm open to considering that as well. I'm headed shopping here in a week or two, so I'm in no big rush about it. Thanks!