Ordered the medium Cal King mattress. Seemed like a very comfortable and solid mattress. Inflated very quickly. I like a firmer mattress and this one was just a little soft for me but a good compromise with my wife who likes a softer mattress. However, noticed almost immediately though that the bed was short. A Cal King is supposed to be 84 inches long. This one was about 80 1/2 inches long. Literally the size of a regular king and was way short for the bed frame. I let it sit for almost a week, never got longer. Not sure if it was a defect or that's just the size they made it. Returned.

I researched for over a month before purchasing. BEST PURCHASE EVER! I was waking several times a night hurting in my hips and lower back on my Temperpedic mattress. From night one on this Members Mark hybrid, I did not wake up once hurting. I even slept an extra two hours! This purchase is well worth the money.

This mattress does NOT hold ip. We purchased it in September and it is already broken down. It was much more plush than expected, as well. Save yourself the hassle and get a nicer one elsewhere. This one was great for the first few weeks and has two holes where we have slept for barely two months! The motion transfer is awful, as well. Such a disappointment. We are returning it for a full refund, it hasn’t even been 90 days.

This is my initial reaction; we chose the Queen Firm - I was worried about the firmness (specifically that the mattress would be way too soft). The rating scale of 1-10 seemed subjective (Medium was 5-6 & Firm was 7-8). Our old traditional mattress was called ‘Firm’ by Sealy and it felt like lying on a brick while sleeping even though there was a cushioned feel if you pushed down while standing next to the bed. My wife and I are in our 60’s and have developed shoulder pain recently from sleeping on that mattress. The Members Mark Hybrid ’Firm’ is perfect … stable but like a pillow-top topper that gives for comfort and support but gently firm below. In the box it was very heavy but unboxing was easy. The air rushed in quickly when vacuum seal was opened and it came into shape quick. Two of the corners aren’t perfect but it’s not a glaring defect - just a small folded and puckered spot. It’s going to be covered by sheets and blankets so it is a big non-issue. The cooling top is nice. I reasoned that we’ll spend 30% of our lives on this mattress so it will be worth the investment to be comfortable. If our sleep experience isn’t good then I’ll update my review but so far - I think this mattress and firmness choice will turn out to be perfect.

If you buy the Ultra Plush, expect a SUPER SOFT mattress. In fact it is so soft, it feels like it is actually hurting rather than helping since there is virtually no support. We like a plush mattress but this is nuts. When you lie on it, and we are not big people, from the side you can only see 80% of us. Medium firm is probably the best. The other issue is sheets staying on. The cover is incredibly slick and the sheets slip off with ease. You will need a zip-on mattress cover that has some friction to keep the sheets from slipping off the corners. All it takes is getting in the bed and a corner will come off. We have the right sized, deep pocket sheets (from Sams). If your weight is in the 100 to 120 pound range, you may not sink like a rock. An average adult (I weigh 190), I am in a hole. This one is going to being returned.

Liked the price slept great for 2 days. The the pain started gradually getting worse 6 weeks in rib pain lower back pain so bad 2 trips to doctor for exrays chiropractor many times. Could be I'm older or wrong firmness or just not for me. Its weird seems soft and hard make it make sense. None the less its going back never hurt this bad on cheap spring matresses maybe my body is like dude you waited to long ive slept on some pretty rough stuff but never had rib pain like this my god never anther hybrid ugh.

This mattress is wonderful!! First good night of sleep in months. We both woke up rested with no back or knee pain. Should have gotten this a long time ago. Came well packaged. If you need to get some excellent sleep. You have to try this mattress - you will not be disappointed.

Love it

This mattress killed my back. Was way too soft (I ordered the medium) and had to return before having it a week. The online return process has been a nightmare! It took 3 weeks for someone to pick it up and they said it will be another 2 weeks before I may possibly see my refund. I will never buy another large item online from Sam's Club again.

Overall the mattress is nice and comfortable, however it is not a true king size mattress. The specs on the website list it as being 76x80, but it is only 77" long. When I put it in the bed frame I noticed a large gap at each end compared to our old mattress. My feet hang off the end. I guess that's how they offer the Sam's discount by removing 3 inches from every mattress.