I have a 2011 SBA and live in the northeast so I do have to trail ride so is anyone running these or run both? From what I've read the curves are a little better just don't want to spend $400 for a test. I know the grippers are a little cheaper but are the curves worth the extra dough with or without the thrusters?Also if I went with the grippers do I have to change the rubber spacer under the ski ? Any thoughts are appreciated. Thanks in advance