Redwood, you know that this is a total load of hooey..
I do think it is something that I might start to mentioin to my customers when I go into their homes...
I would inform them that it would be a good idea to change it while I am at their home for $$ 125.00..
I will not test the T+p valve cause I know it will leak...
but I will gladly change it for safety sake
I dont think i will get many takers.....even at 125
not in this economy