I guess my opinion is biased. I added an NLR Traction Plus to my seat mover and I can't live without "lateral" movement ever again. You need to feel the under and over steer. The seat mover never improved my driving, but really enjoyed it, bumps and all. But the lateral gives me the extra feedback that I am over steering, and my recovery from bad cornering has never been better. So much better than visual and audio feedback only.