I finished a tub after about months of cycling it 2 weeks on, 1 week off. I had strong tingles in strange places like my ears about 15 - 20 minutes after consuming with minimal water. My heart rate would spike when doing simple things like climbing one flight of stairs. I thought it was great especially on gym day with one more scoop 30 minutes before training. It does have a proprietary blend which is a bit of a downside for me personally. There are no supplements that say 'appetite control' that have really controlled appetite for me. I'm pretty good with food anyway but I still get hungry at the same times that I normally do with or without supplements. It's not a biggie for me as I need to eat semi regularly throughout the day anyway or I get dizzy at the gym. The taste is great, I had Pink Mango Slice. I really appreciate the fact that I don't crash as well. I am trying other supplements but I would definitely buy this again if nothing else seems to work as well.