That's the pass I've gotten for the past 5 seasons. I fucking LOVE a basin, it's underrated I feel like. As soon as keystone opens everyone stops riding a bay to go over to key. They're both super fun mountains and I would definitely recommend it! I think it pays for itself in like 4 days too so if you're going to be skiing more than that, then yes do it. Breck is fun too if you want to add it but I still favor both keystone and basin to breck. hopefully that helps!