Useless support. Wasted of money, should have went with other review service. I tried to send an eBook to customer via Feedback Tuner and the pdf file went from 1.8mb to 70 kb, it seem to autocompressed when sent by feedback Tuner which in turn can't be open, asked seller support for help, received a message telling me to send them the pdf file for them to check then nothing, no answers for 2 days. Asking them what happened and no respond at all after that. Will cancel my subscription. The only saving grace is the free 150 email per month. Communicate with your customer if you want to be sucessful in business.