The accurate grounding of sole and wings, together with the applied stress-relieving treatment, makes it extremely accurate when planning – which is what you expect in a high-quality plane.
The Luban brand is manufactured by the Qiangsheng Tool Company, also known as Quangsheng, who are well known for producing very high-quality tools (including the well-regarded Wood River).
Since its market debut, the Luban brand has created a stir with its wonderful combination of high-quality products (at par with established premium brands) and affordable prices.
Below, you can see a review of the Qiangsheng Luban No. 62 low angle plane by guitar maker Gary Rizzolo: