[Tires & Wheels] Grip Control - any experience?

[3rensho]

There are several threads on berlingo.org about this and the consensus seems to be that it is a minor firmware tweak and an extra knob designed primarily to lighten your wallet. A member who lives in CH just posted that he bought it thinking that he could get by with it on snow and ice with all-season tires and Grip Control. His advice is to forget it and spend the money on good winter tires.

Does anyone on this forum have experience with this product? I didn't buy it because I'd have had to upgrade to an XTR which has a lot of stuff I don't need.