Hey y'all! This thread is really informative, keep the replies coming!! I am 36 yrs old, I was shunted at 6mos old. My first shunt was a fixed pressure, it lasted 13 years, my second was also a fixed pressure and it lasted 23 years. I received a programmable shunt YESTERDAY and I am concerned about it mainly because its something new to me and I had such good luck with fixed valves. Out of 36 years, I've only had 12 revisions and only 2 of those were because of valve problems. Any input on programmable valves is greatly appreciated!