I did an insane amount of research when buying my mattress a couple years back, there are _so_ many bed-in-a-box companies now. Decided on Helix Sleep because they offer a level of customisation, and their customer support is rated incredibly highly (which I decided very important if you're going to buy a mattress without trying it).

I love my Helix so much so that I convinced my parents to buy one. They didn't love theirs and sure enough, customer service was hassle-free with the return. So my n=2 recommendation: Helix is the way to go

That said those Glow Lights do seem pretty awesome