I've got KW V2 and really rate them even though they are twin tube. The damping/spring stiffness really suits fast road/track day use. Body roll has been greatly reduced and turn-in response is better, but I had a very tired suspension before so I had silly body roll, proper side mirrors almost touching the tarmac...
They don't have to be super stiff, I find that if I set them to the minimum they are quite comfortable, even with a full Powerflex black kit (hardest compound) and solid top mounts.
My car is in Portugal so it doesn't really make a difference for me, but they are made from stainless steel which, considering the weather in the UK, might be a good feature.
You should bear in mind that the rear shocks that come in the full kit are Koni sports. They didn't even bother changing the sticker on them in the kit they sent me. But so far they have performed faultlessly.
One thing you should consider is that they are only one-way adjustable, whereas the GAZ Gold are two-way adjustable. Depending on what you're going to use them for might make a difference.
Hope it helps