so disappointed

I thought we had done our research. I thought this mattress would be a good bed for a long time. I started to feel the impression, the sagging, after only 6 months. It is about a year since we purchased the bed. I weigh no more than 130 lbs!! It is not like I am a big person! So I am very disappointed that this bed showed signs of deterioration after only a few months. It felt so good at first. We used our last bed for 22 years. (Though we could have used a new bed after about 20.) I will be even more careful when it comes to replacing this bed... which at this rate isn't too far off.