Good integration means the balaclava works well with most goggle styles and covers the goggle-to-face junction adequately. For the majority of skiers and snowboarders, this level is perfectly fine — you'll stay warm and generally avoid fogging issues on typical resort days.
The main trade-off is that small gaps can appear with certain goggle frame shapes, especially oversized or unusually contoured lenses. If you ski in bitterly cold conditions or are sensitive to any cold spots on your face, those tiny gaps can become uncomfortable over a full day on the mountain.
Good integration is a solid choice for general skiing in normal winter conditions. If you mostly ride in milder temps or don't mind occasional minor adjustments to your goggle placement, it offers a great balance of performance and value without stepping up to premium seamless options.