Worst - Pinnacle, Pax 1, MFLB
Pinnacle's mouthpiece started to melt, as is customary, and mine never really got rid of the 'robot fart' taste, Pax 1 always gunked up and had to be cleaned very regularly and was a bit of a herb hog (though the form factor is undeniably cool) and the MFLB I just didn't like coming from a Solo - a more interactive experience but a lot riskier - combustion happened every now and then, battery life is poor.
Best - Firefly (new battery), Air/Solo (one and the same in my book), Pax 2 (surprisingly), ESV
The original Firefly always worried me and I never had a chance to try it out without the new battery but used a friend's and was pleasantly surprised by the taste and feel of the device - the closest I've come to combustion in terms of method, without the worry of actual combustion - and still consider it a great vape for a new batch of herb. The Air/Solo are incredible. Started with a Solo, soon as the Air came out I got that, too, and just really love how simple these vapes are - like a log-vape with a battery
- and how thick the hits are from both. The Pax 2 was a welcome surprise (haven't purchased - still too expensive for my tastes, especially in Oz) and it seems they've managed to fix some of the taste issue with the deeper and less-elongated oven, the efficiency is a lot better (especially with a screen added) and the mouthpiece isn't so obnoxious - the flat MP is surprisingly great (the silicone doesn't seem to impart too much of a taste like the previous model did). The ESV I haven't had the pleasure of buying (that price!!!), but have had the pleasure of sesh-ing with. The instant vapor is incredible. If ever I were to try and convert a combust-er, this is the vape I would put in their hands. It simplifies the vaping process and is basically a dug-out for vapor. INCREDIBLE. Can't wait to get my own.
Thus ends the longest post in history. Sorry y'all. XD
TL;DR: Please, read it. D: