For me personally, I really liked both the functionality of my personal account and the various and convenient methods of replenishing the balance. The original system of payment for the use of a proxy - both for prepaid traffic and as you use PayAsYouGo. Unfortunately, there are not many Resident Proxies in the USA, but the project is constantly evolving and I think geos will be replenished soon. The support is responsive and lively. Upon request, a test balance is issued. The support service is also good, people, not robots, answer in about an hour. Also pleased with the clear api documentation for developers. I recommend it!