I have done a handful of shops for CSA. I have always found them friendly and appreciative. That said, I have not done any work for them since they changed schedulers for my area and the bonuses have dried up.
Without address the issues already raised in this thread, let me also point out - perhaps only for the benefit of others - the importance of time zones. When instructions indicate a specific time be sure to know if the time specified is the MSCs time or the local time at the shop location. With CSA, the difference can be significant. They are in Hawaii and have shops on the east coast. This is a great set of tools for figuring out times: [
www.timeanddate.com]