I've had mine for about three years and have NEVER gotten used to them.
For one thing, bifocals and computer work are a horrible combination -- I forever have a crick in my neck looking up to read through the lower part of my glasses. Then, try being a musician and reading sheet music -- as a saxophonist, I can't simply raise my head and look down my nose without messing up my embouchere...and with complex symphonic music, I frequently lose my place...I had to quit the wind symphony with whom I had played for years, as I didn't feel I was doing them justice.
I really need two separate pairs of glasses, but insurance companies don't see it that way...