I've heard their life span isn't the best, combined with all of the special tank needs it gets pretty expensive. Look up Jelly Fish Art they have a lot better prices and some more info, but I would agree that they would be best by themselves.
As far as them being boring, I think the same could be said about a lot of tanks if you're not really into them then most things would be boring. I think SPS tanks would get boring after awhile. I have friends who think my lion tanks are boring. "What's so interesting about it, they never swim around and are always just hanging there."
To each their own I guess. If I had the money, and could convince my flatmate to let me set up another tank I would do it in a heart beat, but I was told no more tanks so that killed my research.