A buddy of mine at work bought some last year and he swears by them, im not sure if the videos are still psoted online but they had videos of hunts and tests. One hunt will always stick in my head, this guy shot a black bear id say 30 yards or so, the arrow went completely through the bear and through a 50 gallone steel drum, hows that for perfomance. My buddy just ordered th eNew Sonic Pro 100s sounds like im getting his other ones and shoudl have a free one in the mail comming soon.