I'm new to Invision Board. My vps host provider crashed my server during a routine maintenance operation. After reinstalling CentOS and supporting software, all I could get was a blank screen in response. I place a ticket after doing everything I could think of. Support responded to my ticket within 15 minutes requesting info and access to my site. Once I had responded, they investigated the problem. They found that I had neglected to install php-xml support and notified me. Again the response time was on the order of 15 minutes, certainly no more than 30 minutes.
Support has also responded to questions here on the forum in a reasonable time frame. In general, there are several technical types online at any give time.
I don't see how any kind of support could be more responsive than that!
Very satisfied customer,
Jeff