We’ve done uppers and lowers once in 120k miles. Uppers at about 80K, lowers at about 100k. The rear bushes of the lower are now poly. So better than 156s, but not perfect.
One thing I would say is that they tend not to fail like a 156. The 156 model is “make a god awful noise suddenly, followed by a rapid drop off in handling”. The 159 ones have a more gradual failure - they start to feel a bit flabby at the front, while still passing MOTs and not making any noise. Once they start making noise, they are utterly knackered.
Car is a 2.4 diesel, AHM remap, 19” rims, driven like it is stolen over a variety of roads.
Overall very happy with the car - its economical enough, goes like stink, and while it is thrown some chunky bills, it is a big map on it and it is used hard.