Trying to replace a 15yr old mattress that we've loved

Here are the in-home trial details for mattresses purchased from the Serta website:

• Policy: Comfort Guarantee -- Mattresses can be returned for refund (after 30 day minimum trial).
• Fees: A 15% return fee + $200 for return shipping is deducted from the amount credited for returns.
• Notes: The iComfort/iSeries In-Home Trial Period is 120 nights. For other products, Serta's Comfort Assurance program is 45 nights.

Here are the delivery terms for mattresses purchased from the Serta website:

• Policy: Delivery available - Free with any mattress purchase
• Set-up: Set-up provided with delivery - Extra fee applies (+$150.00)
• Removal: Removal of old mattress provided with delivery - Extra fee applies
• Notes: Optional white glove delivery service includes set up, as well as the removal of packaging, your old mattress, and the box spring (if applicable).