The Door Jamb is definitely better than the traditional door frame as it does away with all the disadvantages of the traditional wooden frame with regard to warping, bending, expansion contraction, aesthetics etc.

With regard to strength, wood may be a stronger product in isolation but when converted into a product the refined strength of the Door Jamb is definitely superior to the traditional frame. As a result of this, functionally, the Door Jamb will definitely be superior to the traditional wooden frame.

Will the Door Jambs get spoiled by water?

The Jambs is a wooden material and just like any wood material this should be protected reasonably from water, moisture and heat to enhance the life and appearance of the product. Great care and protection have been take in the product design to protect the product from moisture, water and heat but eventually if the product is abused beyond reasonable care no guarantees can be given. This is applicable for any wooden product.

Can it be exposed to the direct rays of the sun?

Here again being a natural product the Jambs and doors should reasonable protection from sun and rain to enhance the life and elegance of the product. Just like any wooden product, the surface that is exposed to the sun will fade over a period of time. The physical properties of the product could also be affected by continuous exposure to sun and rain over a period of time.