Resin kits are for experienced modellers, not toy for children. The product is not 100% perfect and may have small problems. Not recommended if you are obsessive or perfectionist.
The material is UV resin which has poor mechanical property and may crumble over time.
Resin kits are 3D printed so it must have layers and lines on the surface because that is how 3d print works. The lines are different on different kits and different planes.