What a difference a day makes! Had the progressives installed in 45 minutes and they make a very nice difference in rideabilty. Hard stops and aggressive cornering are especially improved. Well worth the $75. Springs themselves are about 2" longer with double the number of coils, 3 5/8" spacers instead of 6" factory gives about an extra .5" of preload. Highly recommended for those of you who were thinking about it.