Everyone still uses their Tornado?
Yup! It's been days and days now, and I'm still obsessed with it!
Seriously though, from the view of a new user, I couldn't call it the best myself, simply because there's no such thing, but in it's class it's peerless, though it has to be said it's the only member of that class!

But that doesn't diminish it's exceptional function and performance.
Sorry, seriously seriously now - it's unique and extremely useable from the start, even without any instructions beyond "this end goes in yer gob"[sic]. I've managed a good few really dark roasts that even
@PrematureEvaporation would find acceptable and yet not a single combust. It's clearly in a class of it's own and deceptively well designed.
But it's not a suitable vape for using all the time (at least not yet, I've a lot of experience to gain) so 'best' isn't really how I can rate it (or other vapes). Sometimes it's just more than what I want at that moment, or maybe I want something more terpy for the different effects, or I want a more gradual hit, but when it comes to some serious medication while remaining more functional I've nothing better by a long chalk.
At the moment I'm seriously wondering whether I'm going to want to set up the Screwball any more except for maybe a multi-person session where numerous back-to-backs are effortless on the Screwball.