Here is my observation on the Sinister, imo. It just went too long before its move. So what I did is I took a burgundy scotch brite and scuffed the cover. For me this is the only way I could get this ball to react properly. In other words, have back end movement. If I dont let this ball get into a good roll it does not hit properly. But it now has its place. After my Hyper Cell starts leaving flat tens, I will give the Sinister a try. But if I can use my Skid, I will. Again - IMO - the nucleus core is way better than the cage core. They hit and carry better, the Skid just flat out rocks. The Sinister, I would experiment with the cover untill you find the best reaction. I personally use the H/C and the Skid the majority of the time, because they give me the best reactions.