I've been taking SST for about three weeks. Its easier on my stomach than Super HD which always made me nauseous. I take it about 1-2 hours before a workout and its kind of nice because it give me so much energy that I HAVE to work out or else I will be jittery. I am artificially caffeine sensitive because I don't drink a lot of soda or tea, and I hate coffee - so the first day is rough, but no crash. I usually eat shortly after taking it. I am usually at the gym during the "chill" phase so all I notice is that I sweat more (that being said, drink enough water with this). My lack of results is kind of my fault (I like food, and this is not a miracle pill) but it gives me that jump start of energy in the morning to hit the gym which, in the long run, will pay off.
NOTE: I suggest drinking a whole glass of water with it. Last week, I only took a sip to get it down because I was in a hurry and it gave me heart burn.
Bottom Line: Yes, I would recommend this to a friend