I had custom footbeds made for me at the Park City Surefoot store in 2002. I think they did a good job and I noticed an immediate benefit in both my boot fit and edging precision. For the last ten years I have skied 25-30 days each season with the footbeds, over three sets of boots. (Now have one-year old Lange RX130's. Great fit for me and I love the liner.) I have used a second pair of the Surefoots for use in my hiking boots and jogging shoes---pretty much eliminated what I thought had been a gimpy knee problem, but turned out to be severe over pronation in my right leg.
After ten years, should I have my feet rescanned and have new footbeds made? Is there an inevitable degradation of the footbed material after this length of time? I don't really get the impression that the footbeds are shot...but if it turns out these footbeds have a useful life of ten years, then I'm willing to go another round.