Are turbos expensive to fix?

I've been hearing a lot about the potential performance gains from installing turbos in vehicles, but I'm also concerned about the maintenance costs. Could you elaborate on the financial implications of turbocharger repairs? Are turbos generally expensive to fix when compared to other car components? I'm trying to weigh the benefits of increased power against the potential for costly repairs in the future. Additionally, are there any common issues or failure points with turbos that owners should be aware of? Your insight into this topic would be greatly appreciated.