The great thing about this product over the others I have tried was that it has excellent customer service at any time of day or night, and not just during business hours, which other providers do not offer. Very helpful with all my questions, as well as knowledgeable and understanding about how to use their system. Nothing so far! It's pretty good though compared to some of the competitors out there. We are using firstcom for our business communication needs. Being able to make calls from anywhere we choose throughout the world within seconds. This makes things much easier when traveling away from home.