I have to back you up on this. For the last 2 weeks, I've been having a constant issue trying to access my companies network from home. From CISP, I could not connect but on testing, we found that we could connect on any other network provider. Naturally, you start suspecting that CISP has the issue but PBCool helped us sort this out today with our network guys. The issue was that the same IP range that CISP connected from was a reserved IP range on my companies network which caused a conflict and prevented us from vpn'ing in. This had nothing to do with CISP and yet we had PB troubleshoot this and personally attend to it.
This is why CISP has consistently been rated as one of the top ISP's on mybroadband.