Mine has been fine, although it is only 2 months old (250 miles so far, 3x fold per weekday). The adjustment was fiddly for the first week, but has only needed readjusting once since then. I have found the optimal adjustment point is a bit off from where the indicator arrows line up.
The gear range is great for the riding I do. I like the smaller, consistent steps between the middle gears. My main complaint is the cheap and nasty shifter. The ability to shift under load would be nice too.