Customer reviews for Granite Warehouse detail experiences primarily associated with owner Santiago and his installation team, reflecting service quality, professionalism, and project management across various countertop materials and types (granite, quartz, quartzite, corian). Positive feedback highlights Santiago's expertise, attention to detail, quick turnaround times (installations completed within less than a week are mentioned), professional team, and reasonably priced materials, leading to high overall satisfaction and multiple recommendations. However, several reviews point to negative experiences, including delayed service (call/no-show, long quoted lead times despite scheduling delays), poor workmanship (improper installation, crooked fixtures, subpar materials, damaged granite, sloppy toeboards), and unprofessional service (rude phone interaction, material confusion, overall failure of agreed work).