As someone who weights around 175lbs, I found the 8" mattress to be very uncomfortable as there's not enough distance between the comfort and memory foam layers to cushion the biggest pressure points when laying on your side, and even on my back, I would hit the dense foam and create instant pressure. This led to a very uncomfortable night's sleep and will require either purchasing returning it or adding additional layers to the top of the mattress.
I highly recommend staying away from anything less than 12 inches as otherwise there just isn't enough cushioning to get a comfortable night's sleep.
The good parts of the mattress is that both the cover and mattress materials themselves feel very high quality. And it was very easy to get setup. For that I'll give it 2 stars instead of 1.