The unit inside is made of plastic, is this better than stainless steel?

It is not just plastic, it is a special mixture of antibacterial silver-ion coating combined with an extra strong plastic.

The advantages: Round corners and no edges, so it is very easy and quick to clean with the special DRY AGER cleaner. Through the new anti-bacterial coating inside bacteria will be destroyed within seconds, this is unique in the DRY AGER® and worldwide in no other Dry-Aging Fridge available. The inner plastic body has been protected for meat maturing cabinets and registered as a utility model.