I own two Eight Sleep units and have used them for years. I've been beta testing the Somnus Lab cover for 2 months and want to share an honest comparison. Upfront caveat: this review is going to read as lopsided positive, and it is. After living with all three machines, the Somnus is the better product. I'll cover what's worse too, but there isn't much.

Disclosure: I'm in Somnus Lab's beta program and received the unit at half cost. 

Background: my partner and I are ultrarunners. We just finished the Umstead 100 in North Carolina. Sleep recovery matters to us in concrete, measurable ways, not as a wellness-aesthetic talking point. That's the lens I'm reviewing through.

What's better than Eight Sleep

Cooling power. Compared to my Eight Sleep Model 3, the Somnus gets noticeably colder. I can't speak to the current Pod generation, but against the Model 3 it's not close. The one tradeoff: Eight Sleep cools faster on startup. With the Pod I feel cool water within seconds; the Somnus takes longer to ramp. I don't know why, and it hasn't bothered me in practice.

Redundant controls. You get the phone app, plus physical controls on the side of the cover, plus controls on the machine itself. If your internet drops, you still adjust temperature normally. Eight Sleep is fully app-dependent, which becomes a real problem on bad-router nights.

Setup and maintenance. Priming is fast and the app gives you live feedback during the process. Filters sit inside the reservoir rather than as a separate component, and the instructions are actually clear. The cover itself is significantly lighter than Eight Sleep's, which makes installation, removal, and draining genuinely easier. If you've ever wrestled an Eight Sleep cover off a king mattress to drain it, you'll appreciate this.

Dual-zone control. Independent temperatures per side, same as Eight Sleep.

App quality. Updates ship constantly, and Somnus has already implemented features that took Eight Sleep years to add. The app feels like it's actively maintained by a team that uses the product, not a feature-frozen flagship being slowly milked.

No subscription. This is the headline for most people considering the switch. Eight Sleep gates core functionality behind an annual fee that increases over time. Somnus does not. Over a few years of ownership, this is real money.

Company culture. Hard to quantify, but worth saying. Somnus feels like a company trying to build a great product for the people using it. Eight Sleep increasingly feels like a company optimizing for marketing moments and investor narratives; the stunt of sending Musk units while he was reportedly sleeping in government offices during the DOGE situation was a particularly strange choice. Their customer support has been a consistent weak spot in my experience, and that gap shows up when something goes wrong with a $3K+ piece of hardware in your bedroom. I'd rather see that energy spent on support than on celebrity placements.

Recovery: the part I care about most

Body cooling drives time in deep sleep, and deep sleep drives recovery. After the Umstead 100, my HRV was all over the place, which is expected after that kind of effort. One night back in the Somnus and I felt meaningfully better the next morning. I'm not going to overclaim a single data point as proof of anything, but the subjective recovery curve has been better than what I remember from Eight Sleep across previous training blocks.

Caveats on this review

I'm aware this reads as one-sided. The honest answer is that after 2 months with the cover, the only legitimate complaint I have is the slower cooling ramp at startup. Other things you might reasonably worry about: Somnus is a newer, smaller company than Eight Sleep, so long-term parts availability and support are unknowns. If that risk matters more to you than current product quality, factor it in.

Bottom line

If you're shopping cooling covers and don't want to pay an annual subscription to keep your bed working, Somnus is the one I'd recommend. If you already own an Eight Sleep Pod 4 or newer, I can't tell you whether the cooling delta still favors Somnus; I can only speak to the Model 3.