I've a pair of Ana's pattens too. After about 2 years of use, the leather hinge has started to strech. and the soles are looking pretty worn. Other than that, no problems.
I'm not sure if the problem with the hinge is that I've been wearing them in all sorts of crap weather (at Bolton last year, I got 2" jets of water out each side of the hinge every time I put my foot down

), or if it's because I've oiled them too much and the leather's got 'over supple'.
I oiled then top and bottom every time I did my shoes for the last 2 years, but nothing else. The linsead oil sounds like a good idea, but you'll wear it off the sole really quickly.