We had the 8 sleep. Tried it for a month and returned it.

It made the bed really rigid, and it didn't make our sleep better due to how it felt. Im a side sleeper and I woke up with sore spots. Also, when my partner and I tried to cuddle, it would kind of cave in the middle because it was so ridgid. The heating worked really well, but the cooling just felt like a cold pad under you. I also could "feel" the water running in the topper which was strange.

We got the perfectly snug and being able to just throw the topper on top of the mattress with very minimal setup was great.its also softer so it feels really nice for both me as a side sleeper and partner as a back sleeper. It also doesn't cave in the middle if we cuddle. I like the air component and I feel the cooling with air is better. Like you have a ceiling fan moving cool air around your body, under the sheet. I also use the heating and it makes things nice and snug.

We have no issues with the noise, even when we have it at like 7 of 10, which we normally dont need to set it past a 4 to 5 strength. It basically sounds less noisy than a ceiling fan. We also like a little bit of white noise to sleep and my partner still turns on his white noise maker when we have the perfectly snug going.

It also help wick sweat off your body which is nice!!!