I'm forever grateful to have been on Kaiser my entire life, and that all my employers have had it as an option.
It's expensive up front (~$5k per year, my employer covers it thankfully) but the most I'll ever pay per year out of pocket is $1500. Office visit/urgent care is $10, ER is $100 and waived if you're admitted, prescriptions are $20, and the most expensive surgery I could get is $150 which includes the hospital stay if needed. My partner got sterilized for like $35. The biggest thing for me is my therapy is free so long as it is virtual (my therapist is 4 hours away by car anyway), and $10 for an in person visit if I make the hike.
It's absolutely wild how much one's experience can vary with the healthcare system in the US based on their insurer alone.