With the M030 you get the anti roll bars too so even though the price is higher than it used to be it's still a good value package.
http://www.boxa.net/forum/topic/59044-edcs-550-anniversary/?page=19
I haven't yet covered the same sort of miles on the FSD compared to my other set ups but overall impression is very positive. The damping is better. It seems to mean the tyre is in contact with the road more as you get more feedback. This may or may not be a good thing depending on your driving style. I don't lap time the car but I would be surprised if it was significantly or any faster than an M030 car. It's as firm or firmer when you need it to be but the primary ride is better due to the FSD valving and progressive spring.