I'm curious to know who is making these claims and what data they have to substantiate them. As for the 007 valve getting stuck, it is possible if the valve is not maintained properly. We provide instructions on our website on how to perform the service and how to test the valve to see if it requires maintenance. Here is the link:
http://www.forgemotorsport.com/media/valve_service(1).pdf
As for the intake temps increasing, IF the valve were stuck the turbo would have to work harder to reach wastegate pressure and temps could increase, this could also account for the last problem that I'm taking to mean a loss of boost pressure but the sentence is not worded clearly.
From the limited information available, their claim that our valves are the cause of these problems is no different than draining the oil from an engine and claiming it to be unreliable after it seizes.
If there is a valid problem with the valve we are more than happy to repair or replace the valve.