Are you saying that an Ikea mattress will sag after just 12 months, or are you actually just saying that yours won't and leaving it up to the reader to infer that an Ikea one will?
I apologize I wasn't more clear. I don't mean to come across as judgemental of Ikea. I haven't personally slept on one before other than just testing them out in the show room, but we do have quite a few customers who have replaced their Ikea bed with ours who have shared their feedback.