Users appreciate that the TaxJar plugin simplifies managing sales tax by automating calculations and filings, saving time, and reducing the risk of errors. The setup process is noted to be straightforward for some, and the plugin integrates well with WooCommerce for basic needs. However, there are several significant drawbacks. Many users report technical issues, including fatal errors after the trial period, failure to charge taxes via payment gateways, and disconnections requiring manual fixing. The pricing structure is widely criticized as misleading, with hidden costs, particularly for WooCommerce users, leading to frustration. Additionally, support is exclusively email-based, which can delay problem resolution.