I found this I'm not sure if it's been listed. I thought it was interesting. Not trying to promote the website or anything. I don't know their reputation.
The Solo is fantastic!
There are 7 temperature settings. FLIR thermal images show the heating chamber to be nice and uniform. With the Solo, you load the chamber by loading your herb into the glass stem. It was really easy to use the glass stem as a spoon to load up coarsely ground herbs from my grinder.
The herb should only come in contact with the glass stem, although some pieces at the bottom may touch the stainless steel surface of the crucible. The parts of herb that contact the steel may char.
Flavor is very nice and clean. The vapor path is all-glass which is as good as it gets.
The Solo heats primarily by convection, meaning hot air is drawn over the herb to vaporize it. The Solo's convection is very efficient. I didn't have to stir the herbs every few puffs to get an even golden-brown.
Be careful with the temperature settings. On the highest setting, level 7.
This was taken in 2014 with the release of the updated Solo. I'm thinking the top pic with the infrared heat is temp 4 and the bottom pic is temp 7. I searched the article and it didn't specific exactly. The reviewer said that he started off on temp 4 doing a burn off. I'm thinking that's the above picture.
Edit
The convection part I just copied. It was close to the pic so I left it in. Thought it would bring up discussion. We know it's conduction. I always believe my FC friend
@OF He's my go to guy. I'm glad we have him here.