Yes, ticking noise is a very common problem and some cars can be fixed with lifter replacement but some aren't. I was told that you need to replace cylinder head which was newly designed.
I have the same problem and currently fighting with dealer regarding this issue.
dealers will tell you that it is normal to have some noise and it would not further damage the car but if you do more research about it, that is not true.
bad lifter, bad cylinder head means not enough lubrication, oil leak would occur due to build up pressure... you would pay everything from your own pocket if you ignore this problem.
I am paying for BMW and driving with a noise like an old truck does not sound right.
BMW is well aware of this problem and they are not doing 'recall'... this is a big issue.
if this isn't an issue, why would they design new cylinder head???