This mattress is one of the best purchases I've made. It is so comfortable and soft and I can fall asleep within minutes. I should have upgraded my mattress to a Serta Hybrid a long time ago!

It's pretty good quality love it just have one problem it's sinking on my side and my weight is 189lb having back problem would like to exchange it under warranty if possible but all the rest it's fine love the material....

This Observer mattresses set is every comfortable not to hard or soft just right for me. The best part for me is that it makes my body feel cool at night when I'm sleeping. That a WINNER for me!

We have used Serta for many years when it came time to replace old mattress set we looked no further than Serta. It is refreshing to see a product that does not change just for the sake of change. Manufacture a great product and continue to do so.H

We are absolutely in love with our new mattress! It doesn't even begin to compare to our old one. I have sleep issues and haven't had any problems since purchasing this mattress. Only wish we would've gotten one sooner!

First impression of this mattress is the build quality is very good and will hopefully last many years. Love the materials and looks. So far sleep sleep is very peaceful and comfortable. Time will tell.

Really like the firmness and not too hard! Had a great first night's sleep on it and had no hurting back when we got up this morning. It was time for a change to upgrade from a full to a queen size!

Sleep on my mattress for the first time last night, and had the best sleep in ages. I actually slept for 8 hrs. I cannot remember the last time I slept straight thru the night without waking multiple times. Love this mattress.

After trying many mattresses at the mattress store the ISeries 500 came out on top with perfect comfort at a reasonable price. Having both memory form and spring coils in a mattress is a perfect combination for ideal comfort.

Having back issues this bed helps support my lower back and helps ease leg spasms! Our last bed was a spring bed and warn out, this one we wanted to keep the sprint and add a little more firmness of memory foam, we got a win win with out hybrid bed!