Thinking about buying four units...any feedback latency issues?

I am seriously considering using Jamlink for my band and was wondering what people think of their Jamlink experiences so far. My main concern is latency, as we have tried other web based products which have not worked. We are a Latin/Brazilian group, so the time has to be right on with minimal latency ...it truly has to feel like we are playing in a room together.......just curious if Jamlink would work for us....thanks much!