Got around to trying AM-694. Cannot verify anything about it, however, since it came as a free sample in a homemade "herb blend". At any rate, I took a few puffs...
The stone hit me in the head first. It felt like schwaggy weed's headspace, where your mind is high in a general fashion but there's no definition to it. Both me and a friend felt clumsier and dumber as a result of the high, and didn't appreciate it. It really was like crappy weed that makes your thoughts and actions disjointed and awkward. The physical side effects were also lacking recreation. After a hard day at work, this substance relaxed my back muscles so that there wasn't a muscle that was tense, however trying to position myself in a relaxing way was difficult/impossible because my muscles refused to cooperate. In a sense, the high made me helplessly stupefied to an uncomfortable degree.
It lasted a good 4 hours or so, which is very similar to pot, but otherwise it was very lacking in the positive aspects of good old THC. Was considering attempting another trial orally this time, but couldn't stand the thought of being high like that for another 6-8 hours.