On my way to pick up 20's right now. I haven't heard anything bad about the Tien CS, and since they are on the cheaper side of that scale, AND I can get the EDFC for another $300 to put the total cost at what the HKS go for, why not have a sweet control unit from the inside of the car? Coilovers are great, but when it comes down to it, do you really want to bust out the adjustment wrench everytime you want to adjust your ride, or simply press a button and watch the control unit do it for you?
So I guess my answer is I'll be getting the Tien CS with EDFC, after I get my 20's today.
Thanks for the advice.