Like the old ass man above me said, just keep an eye on it.
Mine never leaked, but there were tons of people that had problems, sometimes too late.. Just make sure it's sealed up properly.
It's not necessarily that billet is junk, it's that they will break too.
The billet crank in my 18 DM broke after one year of riding and I hardly rode the thing.
It happens. I fixed it and moved on.