Im a big time Darton fan but havnt shot the invasion so cant fairly give you and opinion there.As far as how a Darton feels jmo,,smoother draw than cpx,,,very smooth draw with a nice valley that most bows with speed dont have.Super smooth shot and as far as Quality they are at the top of the game.They easily exceed ibo speed as well.FYI,In the past few wks Darton was clearing out there 3800"s at drastically reduced prices to make room for there new 37,38,and 3914 series.