Compared to the LS2 runners, these LS2.1 Power runners are great. Since they are a little longer, you gain more power per stride (as advertised), but you also gain more "glide" per stride. This means you're a more efficient skater and expend less energy when skating, and in the end this allows you to either take a longer shift (b/c you'll gain endurance) or be less winded after each shift. Best of all, you will be faster in terms of top end speed AND acceleration. A noticeable improvement in those areas and the price you pay is only a minor decrease in agility/turning radius. Well worth it in my book.