I've had my two SAE since way before I ever got cichlids. They are about 4 inches long now...pretty big suckers themselves hehe. Never ever seen any fish pick on them at all. Running with 4 Rusty's, 3 yellow labs, and a few inch-long guys I got this week. Have previously had a red top that I had to get rid of due to aggression, and even he didn't pick on the SAE.
Talked to my LFS about a month ago about cichlid-only tanks, and he said SAE and plecos were fine. But you have to watch that they don't latch on to your cichlids. He said if the SAE can grab another fish, they'll try to suck the slime coating off of them. Never seen anything like that with mine, but it's what he said, so I'll pass it on. Hope this helps (albeit a long time after original post)...