I played Sunday at the course where I first started golf about 20 years ago. They have never replaced the Common Bermuda on their tiny little push-up greens. Pretty grainy stuff. Like the course Tom mentioned, probably half to two-thirds of the greens have slopes of 4-5% maybe even a bit more in a spot or two.
Hard to say what the average Stimp would be on those. I know downhill putts were every bit as fast as at my home course which has pretty fast green. But something along the lines of the "guesstimated" 1974 Winged Foot values of 5-6 uphill and at least 10 downhill is probably the correct ballpark.
The first couple holes I had one downhiller get away from me and run off the green and had one uphiller left woefully short. But by about the fourth hole I guess my kinesthetic memory from playing there for a thousand or so rounds back in the 90's must have kicked in. I putted fine the rest of the way in.
I found it very interesting how my brain/body system seems to have both "slow, extremely grainy Common Bermuda" mode and "fast, somewhat grainy hybrid Bermuda" modes stored away. Actually I guess I have just about 1,000 rounds each on those two courses so the putting is probably hardwired by now.
While I'm babbling I'll mention one other thing I noticed. The grain tends to run downslope on those turtle-backed pushup greens. So for any hole cut toward an edge of the green there's both a fall-off slope of several percent and the grass Stimps 9-10 in that direction. It really affects how you play approach shots. If you're going to play to the middle of the green and let the slope feed the ball over to the hole you have to play WAY OVER THERE toward the middle. Not just 5-10 feet but 20-30 feet. Conversely, if you want to land in the fringe on the short side and let the ball bounce up toward the hole you have to land it pretty close to the hole. The fall-off slopes and into-grain direction you'll be putting will grab a bouncing approach and kill the momentum pretty fast.
Overall I think I like the added complexity of a big into-grain/down-grain speed disparity as it affects both putting and chipping or approach shot play. It makes trying to fit a ball into the "short side" pay off a bit extra because you can be so aggressive chipping into that grain, even if you miss the green by 10 yards and only have 10 feet of putting surface to work with. That's not a bad position because the into-grain grass checks the ball up so fast.
When I used to play there one of my regular gang was infamous for always shooting 78, 79, 80, 81 while routinely "missing" almost every green. It's because he used a strategy of "below the hole at any cost" and would rather be five yards off the green chipping back into the slope than even 10 feet above the hole putting down-slope and down-grain. Hole after hole if the pin was near an edge he'd be in the fringe just off the green, chip up and have a tap-in one-putt par.
That was enabled, however, by them keeping the grass mown short for several yards past the "fringe". So you could miss greens by 6-8 yards and not be in punitive rough. I doubt they do the same at Winged Foot!