On the occasions when we've had to engage f5 support, they have been great. They have always resolved our issues quickly and been easy to work with and professional. The reason I give them a 10 out of 10, however, is because when we've had issues that have crossed over between the f5 BIG-IP, our Cisco switches, and our Microsoft IIS server the f5 support representatives have been extremely knowledgeable about every product and device involved and have been able to troubleshoot end-to-end without having to engage other vendors.