I'm sure that most of the new advanced heads out today , some part of them began with the old dinosaurs of the past. Slick Tricks could have been taken from them somewhere down the road. Thunderheads and Magnus heads also have spawned the new age of heads. As for them being different, I like the Tricks because they are all steel construction. Not very many heads can say that. Until muzzy's let me down, they'll be on my arrow. But one never knows, maybe I'll come over to the DARK SIDE with the Tricks in the furture, at least not for this year. AS for 2 bladed heads, never expierenced using them. Never could grasp the fact of why someone would use 2 blades instead of 3 or 4. Maybe it's accuracy or penetration, or blood trail. I just found what works the best for my setup last year after a long period of trial and error and it's hard to switch to a new head when it took this long to get it right. Gary, you need to put BigBulls on the payroll, he's doing one hell of a job promoting your product, maybe some free heads or something, or a hat or t-shirt.