I agree that the labels are there for a reason. But I'm not entirely convinced of the reasons for why one should avoid taking the two.
I've read through all those threads before I tried taking both. This is what Cy said in the Spike thread:
"Spike shouldn't be taken with HOT-ROX as it could hypothetically result in some uncomfortable side effects, perhaps over-stimulation, headaches, etc."
So in other words, it MAY be bad. But we don't really know. I tried both simply to see how I would react, and found that it was beneficial to me. I'm not saying to go ahead and do what I do.
On a weekend I take a couple of HOT-ROX in the morning, and a Spike at 9pm before I go out, and that works for me perfectly fine. But then again I used to drink 10 cups of coffee a day, so that might explain why I can take it so well.