Has anyone tried vtwhite.com?

I am currently testing VT White which is a wholesale origination and termination provider for SIP calling. I just wondered if anyone else has tried them out, has any specific experiences, etc. Any info would be helpful while im testing.

If it matters any, specifically I am using Asterisk, SIP protocol, G711u codec. I also run a huge amount of traffic and concurrent calls. Anyone in a similar situation would be good to hear from.

Thank you.

I made a trial account as they offered me a free test, trying out some of what they offer now. Still looking for anyone else that has some experience with them. Thanks.