People usually buy high deductible plans (with or without an HSA) because frankly, you can't afford a real insurance plan on your own. As an example, we have insurance through my husband's employer. The total monthly premium (our share and the employer's share) is $1,200/month. Who can afford to cover their family for $1,200/month?
When shopping for a plan, find out:
-how much is the monthly premium?
-what is your deductible?
-what are your copays, coinsurance, etc?
-what is the policy's lifetime limit? Pretty much all policies have a lifetime limit, the amount just varies from policy to policy. It is the maximum amount they will pay out for you for as long as you have a policy with them. You need a very, very high lifetime limit. Search online for some guidelines. $1 million is definitely not enough. I would argue that $5 million is not enough. I know someone who has a chronic condition that will probably eventually kill him. His monthly treatments are about $50,000. He has had this disease for over ten years. That means the "cost" is about $6 million so far. He is very lucky to be retired military and have government health care, because if he had a private insurance policy with, say, a $5 million lifetime limit, he would have exceeded that already and the insurance company would no longer pay for anything. People usually grossly underestimate the cost of treatment for serious illness/injuries. You are getting this policy in case of some devastating illness or accident that will be very expensive to treat - you need a very high lifetime limit so that you will be covered.
-what does the policy cover? Does it cover the things that are important to you?
-what hoops do you have to jump through if you need to see a doctor? If you need an ambulance?
That is what comes to me off the top of my head. I'm sure there are other questions that need to be asked, too.
HSAs can be good if you are rarely sick and you have enough income and discipline to contribute to them regularly. If something happens to you soon after you start the HSA, it is quite possible that you won't have enough saved up to pay the bills. If you lose your job, it is quite possible that you won't have enough income to contribute to the HSA, so you won't have enough in there to cover the bills when you do need medical care. HSAs can be a good tool, but you need to be aware of those pitfalls.