I first bought the Arizer Extreme at least ten years ago and it’s great for groups, but the Air is best for one person, not necessarily to share, because of its limited ability to hold product.
The battery charge doesn’t last long, and it takes a while to heat up, especially if it has been used a couple or three times before. As others have pointed out, though, at least you can use the Air plugged in and can purchase extra batteries.
Then there’s the glass tubes. I have dropped and broken so many of those glass tubes on my tile countertop that I just ordered four of them (I have three Airs and only one working glass tube right now).
I have searched over the years for a better vaporizer but always end up back to the Air because batteries can be purchased separately and can be used while plugged in.