Saw these on the internet a while ago and was intrigued. They popped up in my local gym store when I was there a few days ago so I thought I would try them out. Any of you guys try these before? Apparently the science is that the larger diameter bar works your biceps, forearm and grip in a different way, engaging a lot more muscle than a smaller diameter bar. Used them on chest day for my bench presses and incline chest presses as well as back and biceps. Got a good pump and my arms felt sore as hell after. Had to bump down the weights a notch after burning out way fast on my normal weights doing hammer curls. Really hits 'em hard. Anyways, just worth throwing it out there. Any of you guys have these, or did I just dump cash into another worthless fitness trend?