I think he might be talking about the actual stainless steel lines used for the turbo oil feed, coolant lines and what not. I don't think he's talking about the actual dress up kit, sleeve kit, etc.

Honestly I think their worth getting. Replace your brake lines with stainless steel lines is a plus. Replacing your clutch line with a stainless steel line is a plus and so on. Rubber lines tend to expand under pressure.