Parts are great quality for what you pay
Parts are great quality for what you pay, however as a mechanic, I would place this in my mid tier section of recommending parts to customers. You get what you pay for, the castings aren't the best shape how an OEM or genuine part would be, but does a decent job as a replacement part.
Bushings and rubber parts are okay and structurally last well and suffer normal defamation as per expectancy due to wear and tear.
Oils / additives - I don't have any experience using but from other reviews or assumptions, seems to be okay.