but what can the SOLO do that the AIR can't?
it's the same heating element.
one battery backup and the AIR has a longer running time.
it's significantly ligher and more stealth
just wondering
It can give you a useful battery level reading? IMO a big shortcoming of the Air. Even if you can 'read' the colors (which not all can) the most important part ('how close to out of gas are we?') is one big useless step? You've got one, or maybe two sessions left. Or none. Or part of one? A step backwards from Solo. When I use Air I miss that. So I count to four and recharge.....if I don't loose count.
No, they are not the same. The seals are entirely different (I think in part from complaints of 'loose stems' with Solo). With Solo you can tip the stem to regulate during the hit, not possible with Air. In exchange we have snug stems in Air. They are similar but not the same.
Well 'the same run time' maybe? To have more you'd need a third 18650. The Solo has plenty of capacity IMO because you can accurately read 5 LEDs on the meter and know you have at least five cycles left. If you need more than 8 per charge that's not going to help of course. I've never been caught with a cold Solo, but I sure can't say that about Air. Like filling the bed of your pickup with cans of gas, you can fill your pockets with 18650s. But like that pickup if the gas tank is reasonable and you have a useful gas gauge it's not a mission critical thing.
It is lighter, but surprisingly easier to drop, at least for me (I tend to be pretty casual, sometimes enjoying the garden as I sip and supervise). Solo has the flats, it doesn't just slip out of your hand if you get distracted or too relaxed.
Other owners who've used both no doubt have their opinions, but I suspect most keep both active?
There are, I think, real advantages that are subjective in value. For some of us, usage patterns overlap enough that I can justify both a Solo and Air, loaded and ready to get picked up. And both do, sometimes with an advantage in mind, sometimes not. I think most guys are well served by either, but might be better served by one over the other which might change with conditions, time of day, gender identity, phase of the moon, or other factors beyond our control.
OF