The  Beautyrest Pillowtop Bonita (Queen) developed a channel where I sleep within 2 weeks of purchase.  I am tall and average weight.  I went back to where I bought it but they did not offer a return or exchange.  ("Sorry about your problem".)  I recently talked with someone else who had the same experience with this mattress.  They lived it for 3 years before the indentation met the warranty requirments.  In addition, they had to pay to have someone come out and inspect the indentation (twice!) prior to the warranty being exercised.

I've had the mattress for 13 months and developed...