Three bids, three lifespans, one price gap. The shingle manufacturer sets most of the rules that decide whether a roof lasts, and almost nobody reads them.
The number printed on a roofing bundle is a test result, not a forecast. Three people adjacent to your decision can translate it, and they will usually do it for free.
A window guarantee only pays out if someone is still obligated, the product is still identifiable, and the remedy is funded. Here is how to check all three before you sign.
Retention money usually gets spent on whichever lever is easiest to pull. The options differ enormously in how long the effect lasts and what it actually costs.