Most complaints come down to data accuracy and limits. Users often report missing phone labels, merged email fields, or converters that silently skip rows. Free tools and online services are the most common source of these problems, especially with large files. Another issue is lack of preview, which makes errors hard to catch early. More stable desktop tools, including Softaken Excel to VCF Converter, are usually chosen to avoid these issues because they offer field mapping and preview options. Real-world feedback consistently shows that visibility and control reduce conversion mistakes.