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Unfortunately, there is no single document that states the products and their associated MTBF data. You will have to go through the data sheets for the products and calculate the MTBF. Below are some links providing more information on the topics and products you mentioned above.
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Article ID:3091 Reboot and Factory Default Reset on ISA500 Series
Integrated Security Appliances Objective Reboot or restart of the
network device is made when certain changes in the settings need reboot
or if the device is frozen. The configuration setti...
Article ID:3403 WAN Quality of Service (QoS) Policy Profiles Settings on
ISA500 Series Integrated Security Appliances Objective Wide Area Network
(WAN) Quality of Service (QoS) policy profiles manage traffic through
classed-based profiles. These profiles ...
Article ID:2922 Cisco QuickVPN Installation Tips for Windows Operating
Systems For a video showing installation tips on Quick VPN, visit
http://youtu.be/hHu2z6A78N8 Objective Cisco QuickVPN is a free software
designed for remote access to a network. It is...