Buying a mattress without testing it first is nerve-racking!! I finally decided on the Lux over the standard because of the warranty (long term investment and less wastage right?!). I LOVE the luxury but it's fairly thick and makes my bed seem quite high. However my lower back (SIJ) pain disappeared on the very first night (it is AMAZING for my back no matter what position I sleep in!) I assume the standard mattress would also provide this support too. As much as I want to give 5 stars because it's so super comfy (it's actually nicer than our extremely expensive latex bed!) it drops a star because it stinks! It has a very chemical smell, even after a few months, I notice it every single night (this is a common trait with memory foam though) :( Also it's not great for 2 people. I normally sleep solo, but when my partner joins me I really notice the drop/slope since he's 120kg and I'm 60kg (between us we go over the recommended weight limit which is actually quite low). The delivery service was super fast. Apparently if you do return it they collect it whole (not rolled like how it arrives), but I'm definitely not returning it!!!