Great matress. First experience with 100 memory foam but love it. Im on the smaller side (120ish lbs) so the medium firmness doesnt sink at all for me. Not the instant  comfort i was hoping for. But, after laying for a few minutes my whole body is relaxed as it forms to me. Ive never slept so soundly. Definitely more on the firm side of medium. So if you want true foamy feel that sinks in a bit it might be good to get the plush option.