I have had MM red stars for about 5 years. Very friendly, gentle, great layers of xlarge and jumbo eggs. Their production does drop off significantly after about 2 years though, like a lot more than purebred heritage breeds and I haven't been overly thrilled with the egg shell quality on some of them. I keep oyster shell out at all times and where other breeds continue to produce excellent shells, sometimes theirs are a little thin. Could be because they lay a lot. They are very easy to raise, are kind of trouble makers on other chicks, but have very good appetites and take cold well.
We are raising new Aussies and Red Stars together right now and they are two of the easiest keepers. Our Blue Andalusians, Red Stars and Australorps are the biggest "bullies" of the bunch. They walk all over the Cuckoo Marans, White Rocks, Buff Rocks, EEs, Cochins and believe it or not, RIRs too.