We bought a king-size pillowtop mattress here after shopping at three or four other mattress places in the vicinity in one day. The sales help was very good and we got to lay on as many mattresses as we wanted to test them out. The guy did say they would not take returns so we had to make a final decision in the shop. That wasn't too hard. The mattress we got seemed just about perfect.
The problems were more in the delivery. It had to go up a narrow stairway with limited headroom and the only way it would fit was with the two delivery guys squishing it down as much as they could (it was 17" thick and not very flexible at all) and then shoving with all their might. The plastic corner guards scratched our oak floors and the door trim was marred in the process.
That would have been OK except that the guys barely spoke to me at all. I started to think that maybe they didn't even speak English because they just ignored my comments and questions for the most part and whatever answers they did give were of one or two syllables. It was frustrating.
The sales person also made it sound like it would not be hard to get linens to fit the 17" thick mattress but in truth they are way more expensive than conventional linens and so far we have not found any that still fit after washing.