Customers mostly report positive experiences with travelsim.com. Customers appreciate that the service works consistently across multiple countries and praise its wide international coverage. Many find the setup process simple and the overall user experience user-friendly. Support responsiveness is generally highlighted as a positive aspect, and some perceive good value in the pricing and packages. Some customers note occasional issues or inconsistencies in specific locations and express that there are occasional gaps in coverage in certain countries. A few reviewers mention difficulty obtaining specific answers or making contact with support. Additionally, some find the pricing and package selection confusing or wish for more flexible options.