Keep in mind, while reading, this strain is actually about as close to a perfect hybrid as you'll find. It's 55% sativa, 45% indica. My best guess is it's commonly called a sativa because it has copious amounts of THCV and limonene which are more common with energizing sativa strains than indicas.
Jack Herer is a pretty fun strain, I've had some of my most powerful psychedelic experiences with cannabis on it. I don't find it to be a particularly useful every day strain, it would lose its fun pretty quickly that way. This is for when you want to have a minor trip. It would become exhausting or boring very quickly if you used it daily or worse (several times a day), it'd just blend in with a lot of other average strains you've tried.
I feel it's best used maybe a few times a month when you really want to lose it, be too high to function because it's fun. It gives me no anxiety or anything, at least nothing disproportionate to all other weed I've ever tried (when I start to get extremely high of course I feel uneasy sometimes). This comes with a rest period of a day or two, if you get high again during that time it's going to be boring or extremely exhausting and you won't be able to function. My opinion, which I've discussed with a few psychonaut friends, is that any psychedelic experience will wear you out physically and mentally for a bit, so I don't blame that on the strain. I'm usually out cold 2-3 hours after using jack every time, but honestly that's just cannabis, no strain really makes me stay up or energetic for long, sativa or not.
Minimal medical value for psychological conditions such as depression, anxiety, etc. It would tend to exacerbate them, if anything. Seemed good enough for pain the few times I've used it for that. I'd call this a recreational strain for the most part. You'd want something much more clear headed for everyday medical use.