You're going to gain KE and shootability. The cams on the Katera are NOTHING like you're Havoctec. Not that the Havoc is a bad bow, it's not. Shoot one and you'll see what I mean. And I believethe Havoc tec is older than 3 years. Closer to 5 I think, but that's a moot point really. The Katera is far smoother, and lots quieter.

As far as what speed you can expect out of it, what's your finished arrow weight, draw weight and draw length?