I finally replaced my 2015 Tuft and Needle Kind size and 20+year old box springs. New box springs were Serta available at Costco. The difference is incredible! I love the new mattress even though it has only been out of the box for 2 hours before we slept on it. Very happy with my purchase. I'm a tall 200lb back and side sleeper, wife is a stomach sleeper. We both feel like it's plush and comfortable yet supportive. No more back and shoulder pain from the old sunk in mattress. No more ridge in the middle of the bed from the old broken down box springs.

Title says it all. After my third night on the new Casper Cooling Select Hybrid, it's going back to Costco. For anyone else considering this mattress and looking for information:

• About me: Side sleeper with scoliosis both in my upper and lower back. Low back usually feels fine. I struggle with neck and shoudler pain frequently, though. 120 lb female.

• Mattress history/what we like: We got a new place where we can fit a king bed. We have two queens: original all foam Casper dinosaur which will be replaced by the new king, and a Westin Heavenly bed (2016 edition, basically an old school Beautyrest innerspring with a soft pillowtop while still being very supportive even right up to the edge). My husband loves the original Casper, I love the Heavenly. The old school Casper is fine for me and causes no pain, I just don't particularly like it, either. We also purchased the Casper Select Original from Costco for the guest room at my parent's two years ago That one I feel the same way about (it is fine, I don't love it.) They changed the Heavenly so it is no longer the same, and also it is too expensive for us at the moment (need to stay under $2k for a king, ideally less). We thought the Casper Hybrid would be a good middle ground.

• Verdict on the Costco Casper Select Cooling Hybrid: WORST. MATTRESS. EVER. Light years softer than the other two all foam Caspers, by a really long shot. The edge support is non existent and my hips just seem to sink right down into the depths of hell on this mattress. I have slept on it for three nights and for 2/3 of them I have had horrific back pain the next day. It has taken the crown for "most pain inducing mattress I have ever slept on", a title previously held by the mattress at my parent's place that was decades overdue on being put out to pasture and hurt us both so bad we replaced it so we could visit them. If you have an all foam Casper now and are considering this one, be aware that this bed does not feel like it at all. The softness feels nice for a minute or so, but then it becomes a sinkhole in the middle zone. For what it is worth my husband does not mind it, but he is also not that particular. A friend came over the other day and I asked her to lay on it for her take. She (similar size as me) agreed that it is way too soft to be comfortable.

Where do we go from here? If we stick with Costco, what should we consider? The reviews on the Lakedridge are extremely mixed. Given I have back issues I would prefer too firm over too soft (and you can always add a topper). I have also read that it is supposed to be similar to the S&F Estate Medium which I laid on at Mattress FIrm and liked, although many reviews say it is much firmer. We also both liked the medium Beautyrest Black at Mattress FIrm (not sure which model, exactly), but that is out of budget. Based on my history, I am thinking I like firm mattresses with plush pillowtops, but it seems the whole world is going the foam/hybrid direction and those are hard to come by now. Is there one out there that is readily available to try, feels similar to the Westin Heavenly or Beautyrest Black, and comes in closer to $1500 or less? Is the Lakeridge even worth a try? TIA!

Costco added Casper Select 12" Hybrid Medium Mattress. Any advice or information on how it compares to Casper mattress on their web site. Is it the same one as Consumers Report rated number 2 in innerspring mattress.