Blast from the past is this thread!
It boils down to this:
If you want your car low without the cost of coilovers, buy Apex.
If you want your car to ride better buy Sportline/Proline
Sure, Apex springs aren't the comfiest but then nothing is going to be as comfortable as standard spring. You have to ask why you'd bother with Sportlines/Prolines if you're not planning on getting the most out of them...
I've had them fitted for a while now and personally (and at the end of the day it is personal preference) I'm quite happy with my Apex springs but then I like a slightly harsher ride. Plus, they don't make the car look too shabby