Did a ton of sessions yesterday. The Air is better in every way than the Solo but battery capacity.
The Air stem is dialed in. The stem uses less glass than a Solo stem, so it heaksoaks quickly to a higher temp than a Solo. Warm up time is MUCH improved. You have to be careful when unloading the stem; grab it just after mouthpiece-glass connection. The mouthpiece works great and takes some of the guesswork out of vaping. The small restrictive hole in the mouthpiece restricts the amount you can draw, so you don't cool down the heater too much.
Good lord this thing rips. The temperature 5/5 seems like 7.5/7 on a Solo. The heater is very similar in design to the Solo, just more refined. The action of the stem+bowl is smoother, no tight fitting issues with my stem, it glides in the heating chamber with a perfect amount of effort.
Compared to an aftermarket turbo style screened bowl, there is noticeably more convection with the stock Air stem with its 4-hole glass bowl, as opposed to a screened aftermarket Turbo style bowl. The bottom of the bowl is more browned than a Turbo bowl. I don't think aftermarket stems will be needed with this unit. Just screens and a couple travel caps will be everything I need.
The grill design on the top half of unit is there to prevent the device from heatsoaking. It is very effective and noticeable. After powering down, the Air becomes room temp in a fraction of the time the Solo takes. You can literally feel the heat coming out of the grill while the lower half of the unit stays much cooler.
The belt holder that is included is a nice touch. You can fit the stir tool and stem(s) in there. The unit looks exactly like a flashlight if you put it in upside down.
For me, this is the best vaporizer money can buy. It has everything going for it that I needed including things that other vapes seem to not have: Stealthy, extremely portable, user replaceable battery, glass bowl that separates from main unit, efficient with any bowl size, etc...