Overall, t-rex makes me feel like shit half the time I'm on it -- BUT, I'm getting good results from it.
As I mentioned awhile back, I wanted to experiment with taking it in a non-calorie-defecit environment on a controlled maintenance diet to see how it effected body composition.
Going by the mirror, scale and strength levels, things are very positive so far... Scale weight is not changing, strength levels are holding steady or increasing -- and definition is improving, clothes are looser around the waist, etc... High potassium intake seems to work well in conjunction for whatever reason.
I find its sides to be unpredictable -- every now and then upset stomach, sometimes hot, sometimes cold, sometimes clammy and sweating, sometimes nothing. I do think I will cycle it as I think it takes a major bite into some of your systems -- I feel lethargic as hell if I'm not on it -- and it's not caffeine withdrawal.
All in all, getting good (aesthetic) results from it, so will continue to use it.