I wouldn’t say I’m very familiar. I don’t use it extensively anymore, and not at all at work. But in general, I can’t imagine a way in which IBM’s own corporate culture could contribute positively to any FOSS projects if they removed the RedHat veneer. Not saying it’s impossible, just that my imagination is more limited than the idea requires.
IBM has been, and still is, a big contributor to a bunch of Eclipse projects, as their own tools build on those. The people there were both really skilled, friendly and professional. Different divisions and departments can have huge cultural differences and priorities, obviously, but “IBM” doesn’t automatically mean bad for OSS projects.