Reviewers see ChatDOC as a fast, easy document-reading assistant that is especially useful for research, thesis work, studying, and skimming books or papers. Users repeatedly praise its reliability, direct citations, and strong handling of tables, saying it helps them trust answers and work through documents faster than similar tools. The main complaints are practical limits rather than core quality: restricted upload size, incomplete coverage of some academic papers, no API, occasional issues with the selection tool, limited output variety, and no diagram generation.