Maybe I’m too new to pre-workouts but blimey, my second attempt on these bad boys (4xpills an hour before training) caused significant health problems for next 10 days. After taking on Tuesday at 3pm on empty stomach 10 minutes later my head felt like it was going to explode, heart rate tripled whilst sitting at my desk home working and caused anxiety for the next hour with tight chest and neck running through to the evening. These side effects then continued for the next 10 days and had to go into hospital on day 5 as heart palpitations were continuing and tight chest with light headedness. I have had no prior medical/health concerns or conditions, I am a fit and healthy young man. Doctors couldn’t find anything wrong with my heart or blood and advised me to stay away from these pills and to monitor my situation. Probably not the right pills for a newcomer to pre workout!

These work the best with Chest, Arms & Legs for me. Muscles really pop during and after the workout. The pump I got was crazy and I really recommend these for anyone chasing the best pump you'll ever get. Arms are the best to get a pump with these capsules and you can feel the difference during and after the workout! *I took 4 capsules 60 - 90 minutes before I'm working out and on an empty stomach for best results*
Goes Well With:
Pre workout so you can can not only chase the pump but HUNT it!

Absolutely zero effect, don’t know how it can be sold as a product. You’d get more pump off the wind.
Goes Well With:
The bin

This product is amazing, I've taken it before workout ,brilliant ,taken it right after a workout and sounds crazy but it made me look more pumped two hours later
Goes Well With:
Anything

I take it with my coffee 1 hr before gym and 1/2 hr before pre . knock out a good session and look jacked for hours after . i see real definition through out the day . highly recommend this product . 
Goes Well With:
pre workout 

I have used it only 3 times: once doing weights, and 2 x times road cycling very intensely an hour each time. Each time the dosage was as recommended i.e. 4 capsules an hour before the workout. While lifting I think I didn't feel anything unusual, no pump, no increased strength or endurance. On the bike though I did experience increased energy, not necessarily endurance as after an hour I was knackered, but my normalized power was about 50 Watts higher than usual. Maybe the taking coincided with my higher form on those days. It happens at times. This thing doesn't shake you up the way, say, Nox by Dorian Yates either. I didn't experience increased heart rate, sweating, hyperactivity, dehydration etc. As such it is pretty mild as I am normally very sensitive to such supplements and get to feel any effects stronger than other people. Which may likely as well be seen as being an advantage. I may buy this supplement again, but am a little on the fence if I really need it.
Goes Well With:
Water, tea, coffee. Best on an empty stomach.

One of the best supplement for pump. Very effective.