I put the Racingbeat mazdaspeed springs in 2 weeks ago, although the ride was fine the back was way too low compared to the front. I found out the sedan rear springs are a full coil shorter, so I just installed the Eibach Pro kit springs in monday with the stock struts. So far so good, I am driving to the Adarondacks tomorrow so we will see how they hold up over long distance with a full load. BTW, when I get back, I will have a set of masdaspeed springs with about 100 miles on them for sale!