The Sinister really needs to have the cover readjusted after EVERY league night. It lane polishes quickly and can get squirty and lazy pretty quickly. I have to take mine back to 3000 before every single set, and I refresh the cover every 3 to 4 sets by hitting it with 1000 first. I've used mine a lot since it came out and oil saturation isn't a problem yet, keeping the cover at the right surface has been the issue. Been fairly easy to do though, just keep the cover fresh and it will be just fine. It reacts really good with more aggressive surfaces though, I've had it at 2000 before and ball motion has still been great, hasn't lost any hit or gotten pukey.