I certainly don't find the bilstein 4600 stiff....but I have not tried OME. I just put bilstein 4600 on my 96 stocker, and it rides great. I'd do it again.
I'd like to hear about your CS experience.
Took me a while to find the actual details. It has been a couple of years.
I installed a pair of Bilstein 25-193145 5160 series shocks on the rear of my '96 when I did my D44 swap. This included custom shock mounts, designed around these particular shocks. One of the shocks blew out all its oil on the first trip out (President's Day weekend, 2018).
I don't have the exact date I took the shock into Bilstein, but it was within a couple weeks of that trip. They refused to warrant the shock, claiming that I must have meddled with the screws for the remote reservoir line, which I had not done. It is always best to blame the customer for their problem and call them a liar to their face. BTW, the guy who did that also refused to give me his last name. Said "Mike" was all that was needed. One of his coworkers slipped later on however. "Mike Ritchie" was his name.
Since I had designed my shock mounts around these shocks I agreed to pay the price to have the shock rebuilt and also upgraded so that it could be serviced, left it with them with instructions to call me to pick it up when ready and to include along with the rebuilt shock a pair of the magic washers which are required for the remote reservoir line and the correct torque setting for installing said magic washers.
It took them until April 5 of 2018 to get back to me with an expected date for rebuilding the shock. At that point "Junior" said it would be 10-12 weeks.
On May 9 I got back into town from a trip to find a message on my answering machine that the shock was ready for me to pick up. Huh? 10-12 weeks? And then discovered it had been shipped. And I received it without the washers/torque spec. I still insisted on getting those and they mailed those to me. And I got a credit back out of them for shipping the shocks when they had written instructions for me to pick them up.
In short, no warranty and customer service on a par with the DMV.
I wish them and the horse they rode in on all the gratification they can achieve together.