Side-by-side mattress testing · 144+ comparisons published
Updated May 2026
Category
Serta iComfortPro Level Three
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
7.6/10
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
Serta iComfortPro Level Three
Vispring Devonshire
Price (Queen)
$3,599
$3,950
Type
Latex Hybrid Foam
Handcrafted Pocket Spring & Natural Fill
Firmness
5.5/10
6/10
Height
Varies by comfort level
8.3 inches
Trial
120 nights
Retailer-dependent; typically 60–100 nights
Warranty
10 years
30-year guarantee (the longest in the industry)
Shipping
Free shipping
White-glove delivery through authorized retailers
Key Advantages
Why Choose Serta iComfortPro Level Three
- Up to 13" of professional-grade latex — the deepest comfort stack Serta sells
- Graphite-infused latex adds heat dissipation
- Five support zones for alignment
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