I own an herborizer XL that i bought on a french grower forum, i never had any smell issue.
The whole setup give me big tasty clouds after 15min heat up, it can lead to a very dark brown material , but even at full temps , it never combust anything.
I vaped some home made bubble hash last week and it did fine.
I have forgoten it a couple of time at 3 o'clock for a few hours and wires didn't melt.
I'm quite happy with this vape but i would'nt have bought it at full price(i actually did have it with tube , sphere and whip adapter for the price of a "tube xl unit").
Glass work is classic but well made.
The bowl is very large so its a great group vape with the sphere+whip setup, you just stir a little sometimes and it can last for hours!
4 years ago , it was one of the best . Now that there is the cloud , LSV , Vrip wand, i m not sure it is such a good deal. The design is sometime annoying: to much wire and glass that can break, vertical length make the gravity center goes up and the weight of the injector and the wire on the upper part doesn't make it better ; i just get paranoid every time a cat get close to the unit.
Since i live with 2 dumb excited cats now , it became my sunday afternoon vape and i'm constantly carefull during a session.
At a point that i really think about getting a plenty or SSV or LSV in addition to my mlfb/PD/herbo setup just to make long session from one bowl without the paranoid state of mind, and keep the herbo for partys.