Now, this is only my opinion. I fitted 30mm H&R springs on nearly new 200 cup dampers on my 36k R27. The reason I changed dampers was because I found some very cheap ones on ebay (4k miles) so I though what the hell, the car has nearly 40k miles after all, the dampers must be kind of tired...
Anyway, I tried to do as much research as possible prior to buying the springs. I was looking for spring rates, how progressive these are, how the ride is going to be etc. However I couldn't find any answer on the spring rates but anyhow I decided to go for it.
To my surprise the H&R springs are MUCH thinner than the CUP springs (maybe that's why the cup springs are so expensive???) and that made me think that they are probably ''softer'' than the stock ones (especially to the 200 cup which are stiffer than the 197s anyway). Still, they don't come with rubber tubing at the low end of the spring as the eibachs and the stock ones. So before I even fitted them I was quite disappointed. But then I thought, oh well, maybe the material is different etc.
I had the springs fitted, the stance now much better, basically it looks the business but I can't say that for the ride. I personally don't mind the stiff ride but I'm not talking about stiffness here. The ride is crashy and that is probably because the suspension has now 23mm less travel and on top of that I don't think the ride is stiffer than stock. I really don't think so (and I wanted it to be). I still believe that the cup springs are stiffer and I could put money on it. Maybe the H&R were designed for the ff one which is relatively soft? just guessing...
Now the body roll, well I can't really tell to be totally honest with you. I know the front cup springs are progressive and the rears are linear as opposed to the H&R ones which are all progressive (please correct me if I'm wrong) and the car sits higher on the cup ones but does that - only by itself - really play a significant/absolute role? What I'm trying to say is that in the low speed corners the car with the H&R feel more planted (quite expected) but what happens in the high speed corners? The body roll is equally the same if not more...
Long story sort and this is ONLY MY PERSONAL REVIEW, I'm not happy with the springs and they are going off, I'm saving up for some H&R coilovers in the future. Hope that helps.