I have just bought my 2nd set of Goodyear EfficientGrip performance tires after having previously owned on my prior vehicle (same car), in actual fact these tires were probably the reason I was not injured in an accident that resulted in the car being written off and I had to replace with my current! The stopping power in all but the worst road conditions is superb, considering that these are "Green economy" tires, you normally have to take a hit on the braking ability and handling grip, but these tires really do deliver the best of both in a healthy compromise.Better in the dry than wet (unsurprisingly), but equally confident in either condition. Others have commented on the side-wall distortion (rolling) effect of these tires, but I find that this ONLY occurs when accelerating/decelerating hard and turning at the same time (for example a roundabout@speed), but otherwise they are fine...let's not forget, performance around the Nurburging will unlikely be your principle reason for purchasing this model of tire.
Most of us will be buying for the economy, mileage & handling. Since fitting them (100 miles so far) my MPG has increased by 2MPG, which cannot be a co-incidence as previous tires ran a consistent 51.3 MPG over 14 months with a smooth and steady driving style-increased to 53.3 with GY-EG fitted. Obviously I have only just got these ones, but the previous ones I owned exceeded 17,500 miles and still had 4-5mm of tread on each tire before the car got scrapped-astonishing really...considering the "Landsail" tires they replaced barely lasted 11,000 miles before becoming illegal and an MOT fail! I have already commented on the handling; I do tire (hah!) of reading other people writing about how these tires lack response and "feel of the road". If you want that performance; buy a Conty or Pirelli which will clearly not last the distance the Goodyears will! All-in-all I am very happy with the purchase and consider them superior to Michelin Energy model that I owned prior to these on the original car. Whilst good on miles the performance in the wet was sorely lacking, which is gladly not the case with the Goodyears. Buy with confidence if economy, value and long lasting performance is what you're after.