First thing you notice when comparing the ingredient list of both Thermadex, and the new Thermadex Black, is that the proprietary blend has been reduced from 556mg to 480mg.
This might seem as if they've watered it down, but i think the word 'refined' is more fitting.
For me, the new Thermadex outshines the original for a number of reasons.
With the old formula, I would sweat like i'd just done some HIIT. Even if i was just sitting still. With Thermadex Black, i felt significantly hotter inside, but the sweat wasn't spraying out of every pore, which was a nice change.
The old formula gave me incredible focus and energy, but was lacking in the 'feel good' vibe that I get from ANS Diablo. Seems as though they have addressed this as the focus was still there, but the 'feel good' vibe was definitely also their.
Depending on what I had eaten, the old formula would occasionally make me feel a little light headed, (this could be due to the caffeine content being higher, though hard to tell from a proprietary blend) the new formula didn't seem to have that problem.
Keep in mind I do intermittent fasting and usually don't have my first meal until around 2pm, so the fat burner is always taken and used on an empty stomach.
I also quite like the noticeable change in my heart rate, it wasn't uncomfortable, but it was nice to know the product was working and i'm thinking this is due to the higenamine.
Overall I think it's safe to say they have improved the formula, and refined their product.
Can't think of any other product on the market I enjoy using (other than Diablo) more than this new Thermadex Black.