I have heard to many negatives in the Havoc series, I have a full LRP set up on my SC10 and I have a X-11 10.5 and a 17.5 that I love, they run very cool quiet and smooth, the 10.5 is a little much in a Sc10, but a 13.5 just arrived in my mailbox today and that's going in tonight.
Also after hearing some negatives about the Havoc system which I thankfully had still in the package I returned it and picked up the extra X-11 13.5