Count me as one who is not as happy with Simonis 860. I'm a beginner and it's too fast for me--it's too hard to control speed. The cue ball just keeps rolling, even on light hits. Also, it's much faster than the cloth on the 9-foot tables at both pool halls I've played in, which play more the way I think of as "normal"--"neutral" would be another way to describe them, they don't seem too fast or too slow. I end up playing sort of "gingerly" at home; often don't feel like I can stroke normally. Again, I don't have much experience and I'm not that good at pool.
But for instance with a nearly straight-in shot on the side pocket, just a little angle, with draw, it's hard to stop the ball before the end rail. That might be because I hit draw too hard, but rolling four feet sideways on a 170- or 165-degree angled shot when you're *trying* to hit it soft seems a little excessive.
I've had the cloth for 3-4 months and it might have slowed down a little, but just a little.
I would personally get a slower cloth if I had it to do over again, at least for my first 3-5 year stint with the table (before 1st recovering).