Hey, you welding gurus, is this a good helmet?

I have bought a cheap auto-darkening welding helmet. It works well so far.
Here is its specification:
UV/IR protection: Up to shade DIN16
Light state shade: DIN4
Dark state shade: DIN9-13 free adjustable
View size: 96*48mm
Battery: Lithium battery +Solar cells(No Battery change required)
Switching time: <1/30,000S
Ultraviolet trasmittance: 313nm<0.00006%, 365nm<0.00006%