Well, it finally happened. Although I've been wearing varis for 20+years I've never needed to wear them walking or climbing. I've started in the last year or so, and have been very unsettled, especially on rough descents.
Yesterday I had my first tumble, walking down the path from Cautley Spout. A momentary lapse of concentration, for sure, but I'm also convinced that wearing varis didn't help... At a step in the path I went to put my foot down and suddenly the ground was further away than I'd expected and over I went, head over heels and into a stream! It could have been an MR job but other than a few bruises and hurt pride I got away with it.
Food for thought - I'll be more careful wearing varis in the future, and suggest that others might consider similar - maybe your/our unsteadiness isn't simply old age?