In my setups I get good effective range with them. Can probably get better hop ups for maximum range, but my philosophy is that if you can't hit a man-sized target 9/10 times at a range, that range is useless, so I love the autobot rubbers for the consistency and grouping they give me at 50 - 60m in 1.1J builds and 75 - 80m in 2.3J builds.
Also, they work very well in the cold and they don't seem to dry out as much as regular hop rubbers. I took my TM AKM out after not using it for over a year (it has a ML 60 degree silicone MR hop rubber) as I finally got mags for it. Took it to the range and it shot just as well as it had before I put it away, though with regular hop rubbers I usually have to shoot a bunch of BBs through it, or worst case replace the hop rubber if I haven't used it for a long time.
Yeah, I have no idea either. In theory, I thought it'd be great but they were just awful. I didn't get any feeding issues in mine, but I did get BBs going all over the place. Couldn't even hit a man-sized target 1/10 times at 45m, where the same build with a regular macaron could hit the 9/10 times on 60m before...