I have shot the drenalin, sb xt, sb, and outback and the smoothest, bow of the all is the regular switchback. The drenalin has nice speed, but a little rocky in the hand, compared to the xt, and switchback maybe because the weight of it. It is quite a bit lighter than the others. But overall the switchback out shoots the xt, and the rest.I have always been a mathews man, you just can't beat the smoothness, but if I wasto buy a new bow right now it would be the new Bowtech. Shot it and I will tell you whatcompared to the drenalin, It edges ahead just a little. Vibration is about the same on both. Blazing fast, at 60 pds,it can out shoot the mathews at 70pds. But it is not smoother than the sb xt or switchback. faster, but not smoother.Also have hada whisker biscuit for the past 8 years would never change, just make sure you always put 2" duravanes with that little extra glue on the front. Works perfect, doen't affect arrow flight.