I had some chest congestion a while back and have managed to use that to switch to vaping almost exclusively for probably six weeks, give or take. I figured I'd give some thoughts on the devices I've been using.
Arizer Extreme Q: This now lives on my desk. Used with a bong and the remote control for the fan, it is awesome. Without the bong it great too, but a little rougher on the throat. Since it is full convection, it is a true "on-demand" unit. I can taste the terps for a lot more hits than with any of the conduction based vapes. The "elbow pack" method is ridiculously efficient. I just leave it on all day, generally set around 212C, so big clouds are always on the horizon.
Boundless CFX: This unit is probably getting the second most use. One load of the big chamber gives two powerful 5 minute sessions (auto-off after five minutes). The first session has way more terps and larger clouds, but the second is still powerful. Usually set around 192-195C, it reaches temp in 20 seconds or less and gives a little buzz/vibe when it gets there. Easy to clean, especially after subbing in one of the Extreme Q basket filters for the OEM one. Charge by OEM adapter or micro-USB
Arizer Air Gen 1: I'm thinking this one is about six years old and has gotten a lot of use over that time. With swappable batteries and preloadable stems, it is the best road unit I've found. My next vape will likely be an Air Gen 2 or Arizer Solo Gen 2. (There are some great deals out there on Gen 1 units of Air and Solo, btw)
Dynavap: Still the hardest hitter of any vape I've used. Just
holy shit! powerful. I use it often and love it, but due to the convenience of the Q, it's used less than the others. I want to DIY a conduction heater for it, but I have so many other projects on the list. Heaters can be DIY-ed for next to nothing but cost hundred$ to buy.
Xmax Starry 3.0: This is a good little vape. I just don't use it often because all the units ahead of it are better than good. It would be very handy in a prohibition area, due to its small size. It also has a swappable battery.