We returned a hybrid 3600 bed to Mattress Firm in exchange for this mattress. I have to say it was very well worth it! We have an adjustable king size base and this fitworked out perfectly. The hybrid mattress we returned had me feeling like I was 100 years old when waking up but this mattress didn’t make my body feel achy. 
If you are wanting to buy this mattress I would highly recommend.