I will tell you our experience, in case it is helpful. We retired when we were 60 (our birthdays are 4 months apart) and did COBRA on my insurance for 18 months. It was about $1400/month. When it expired I waded through options - I set up a special burner email account and Google Voice account and looked for insurance agents. Don't let anybody contact you on your regular email or regular phone numbers, it has been months and I am still getting lots of messages. I went through the numerous sketchy messages until I found a couple that sounded reasonable. I talked the them and was impressed by one guy who explained how to tell if he was a legit insurance broker (I googled to verify) and who sent me his insurance agent registration info for my state. He is in Florida, I am in Georgia. My husband and I talked to him and it turned out my husband qualifies for private insurance that does not meet ACA standards (mainly it does not cover you if you are pregnant, which is fine for a man over 60). His private insurance is about $650/month and the rate is guaranteed for 2 or 3 years. I did not pass underwriting for private insurance (I have an autoimmune disease). I called all my doctors and asked what insurance they took. Then I got on the ACA website and waded through all 17 pages of available plans. I am pretty healthy in general and my autoimmune disease (Hashimotos) is well controlled so I settled on a Bronze high deductible ($9000 deductible and $9000 out of pocket max) plan. I called the insurance agent and went over the options and he agreed I had picked the best plan. We do not qualify for subsidies, so my ACA plan is a little over $900/month. Our total is around $1600/month now, not terribly more than COBRA. The main downside is that there were no PPO ACA plans available so I have an HMO. Luckily my doctor is great and refers me to anybody I need with a quick message. For what it is worth, unless our health changes a lot, I plan to sign up for a high deductible Medicare supplement from Boomer Benefits as well in 3 years.
ADDING: My COBRA had Vision and Dental. We don't have that now, but we get some Eyemed coverage through our LTC policy, and our dentist has a membership plan that costs less than our dental insurance did, and covers more.