I've seen enough reviews on Isa Browns over the years and know enough BYC members who have them to know that the health of Isa Browns can vary a lot from member to member. I wasn't suggesting that you weren't speaking from personal experience regarding the health of Isa Browns. I had no idea whether you had any experience with them, but was merely pointing out that poor health with Isa Browns is not universal. Myself and other members such as Yorkshire coop who posted (I could mention others as well) have not had particularly poor health experiences with our Isa Browns (Red Sex Links). However, as I stated in my post, the Black Sex Links do seem to be hardier, laying longer and living longer.I love ISA browns like any other of my chickens, however they drop dead or get sicknesses that can't be fixed and die slowly and early. They do not live long.
My experience would be consistent with other forum members, there is a review here.
Interestingly enough, under our Breeds section Red Sex Links have received a 93% positive review rating from among 54 BYC members (https://www.backyardchickens.com/products/red-sex-link), which is exactly the same positive review percentage rating (also 93%) as Rhode Island Reds, a heritage breed (https://www.backyardchickens.com/products/rhode-island). These numbers would seem to suggest that those who've had major health issues with their Red Sex Links are the exception rather than the rule. My advice to gottaloveanimals is to read through these reviews before purchasing Red Sex Links and then make the decision whether to purchase them or not.Opinions on these is certainly divided. Based on my experience with them, I have to agree with @Michael OShay and Yorkshire coop. The red sex link girls I have are healthy, friendly and good egg layers. I've enjoyed having them in my flock.
Good luck to you, thanks for joining us!