Side-by-side mattress testing · 144+ comparisons published
Updated September 2026
Category
Amerisleep AS1
Plank Firm
Comfort
Not lab tested
8/10
Support
Not lab tested
9.5/10
Cooling
Not lab tested
8.5/10
Edge Support
Not lab tested
9/10
Motion Isolation
Not lab tested
8.5/10
Durability
Not lab tested
9.2/10
Value
8.5/10
8.8/10
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
Amerisleep AS1
Plank Firm
Price (Queen)
$1,049
$999
Type
Memory Foam
All-Foam
Firmness
8/10
9/10
Height
10"
10 inches
Trial
100 nights
120 nights
Warranty
20 years
Lifetime (limited)
Shipping
Free shipping
Free shipping
Key Advantages
Why Choose Amerisleep AS1
- Excellent spinal alignment for back and stomach sleepers
- Bio-Pur foam sleeps noticeably cooler than traditional memory foam
- Very responsive — no stuck-in-the-mud feeling
Why Choose Plank Firm
- Flippable — firm and extra-firm surfaces in one mattress
- Excellent for stomach sleepers
- Great spinal alignment