We have grooved freeways here in So Cal and center grooves on tires tend to track on the freeway, not fun. I may try them as the grooves are a bit off center, just concerned about when the tires start to wear.I've had both the GT's and the GT2's. To be honest I felt no difference at all. Angel GT's are still available, I just ordered a front the other day. Unless you're referring to the Angel ST's.