Side-by-side mattress testing · 144+ comparisons published
Updated September 2026
Category
Sleep Number ComfortNext Lux
Vispring Devonshire
Comfort
Not lab tested
Not lab tested
Support
Not lab tested
Not lab tested
Cooling
Not lab tested
Not lab tested
Edge Support
Not lab tested
Not lab tested
Motion Isolation
Not lab tested
Not lab tested
Durability
Not lab tested
Not lab tested
Value
7.5/10
8.4/10
Blank cells mean that model has not completed our instrumented lab protocol, so we publish no measured score for it. We never estimate a number we have not recorded.
Quick Specs Comparison
Spec
Sleep Number ComfortNext Lux
Vispring Devonshire
Price (Queen)
$3,999
$3,950
Type
Air Chamber Hybrid
Handcrafted Pocket Spring & Natural Fill
Firmness
5/10
6/10
Height
13 inches
8.3 inches
Trial
100 nights
Retailer-dependent; typically 60–100 nights
Warranty
15 years
30-year guarantee (the longest in the industry)
Shipping
In-home delivery
White-glove delivery through authorized retailers
Key Advantages
Why Choose Sleep Number ComfortNext Lux
- Superior pressure relief for all major pain points
- 67% more cooling materials than ComfortMode
- Superior airflow engineering
Why Choose Vispring Devonshire
- Hand-nested calico pocket springs — the original pocket-spring maker since 1901
- 30-year guarantee is the longest warranty we have ever verified
- British fleece wool comfort layers breathe and regulate temperature naturally