I read somewhere the Solo was designed in 2008. It had to have been some time around there or earlier, I will ask Arizer. The Crafty, Alfa, Inhalater, Firefly, Air, etc are all contenders. Whatever floats your boat.
It is very subjective. Process of elimination is the easiest method to determine which vape is for you:
- Does price mater to you?
- Portable or thin pen style? Do you want a heater with some balls (larger unit), or a smaller thin pen-style vape? Answer Yes for balls, no for thin pen.
- Stealth matter to you? Very few vapes are debadged.
- Need a user removable & replaceable battery?
- Do you care if plastic is used on the exterior of unit and/or near bowl?
- Do you want a removable glass bowl/stem, or a unit that has a built-in plastic mouthpiece?
... [Insert your personal constraint/preference here]
My answers to those questions are: Yes, Yes, Yes, Yes, Yes, Glass. This narrows it down to just a handful of portable vapes. If you answered: No, Yes, No, No,..., or similar, then you would be looking at a Crafty/Mighty, or other high end vapes like a MiniVap for example.
I impulse bought the Arizer Air which passes every one of those constraints, hopefully.