High resale value. Subaru has a very strong following. Many sales are to multiple Subaru vehicle owners. High-end materials are used in the manufacturing process. Even with US assembly, the Outback is very well put together.
Almost all Subarus made the IIHS.org top safety picks. This results in SIGNIFICANT insurance savings in the long run. Compared to a Mazda6 Wagon, Audi A3, Volvo T5 and Cross-country, the Subaru is much cheaper to insure (at least in my jurisdicton).
Excellent and consistent reliability. The boxer engine is very smooth and consistently powered through all rpms.
Very safe vehicle. Excellent crash test results. Safety and construction plays important part in insurance premiums. Insuring a Subaru is much cheaper than competition.