This product is great for a workout energy boost. That being said, I hoe four stars and not five because I used as directed( up to 6 pills a day) I think the level of caffeine, and caffeine like chemicals, would be way to high. All in all though I love this product as a way to work out longer and harder.

Thanks everyone who wrote reviews. I saw this on TV last night and thought "THIS IS WHAT I need'. As a consumer, I want to read what customers are saying. Somewhere in the middle is usually a fair observation. Sorry Zap. Your Zap appears to be a dud based on customers who bought your product.

I just received mine, sold by amazon. It is brand new, but not the charger in the picture. The charging status window is different and in one corner. On Energizers web site they have the same picture as on Amazon. The UPC code is not given in the product details so i can't tell if it is the same thing. Waiting to hear from Energizer if this is a new model, or an old model. 3 stars until i hear back from Energizer.