The ease of use, the amount of features that are available, price, customer service and technical support. We have purchased several domains from 1API over the years, with no problems and great support. I highly recommend 1API for your domain needs. As of now there are no downsides to using 1API. If you are looking for a good reliable price that you can trust, try 1API! We have registered many domains with 1API. They all worked well and were easy to set up. They are also very friendly and helpful when it comes time to resolve issues or questions about the products. The customer service is excellent, they are always available to help with any questions that may arise. Very easy to use website for domain registration. I have not found anything that I dislike about this domain registrar. It's very simple to register your domain. I highly recommend this service to anyone looking to purchase their own domain. I am using it to secure my business website. It has been very simple to set up my site and protect it from hackers.