Are cylindrical goggles good enough for serious skiing?

Yes, absolutely. Cylindrical goggles provide clear central vision and adequate peripheral awareness for the vast majority of skiing situations. The optical differences between cylindrical and spherical lenses are most noticeable at the far edges of your peripheral vision, which you rarely rely on for critical decisions during normal riding. Many professional park riders and experienced skiers use cylindrical goggles by choice. Focus on getting the right VLT and tint for your conditions — that matters far more than lens shape.