When DH retired in 2010 we used his retiree insurance, nicely subsidized for both of us by his pension system. There were 3 level options and we chose the Basic, cheap coverage. The cost went up substantially every year. In 2013 they stopped offering the Basic, cheap plan and they only offered the Premium, expensive plan. Our cost increased by $400/mo for that year! And then they stopped subsidizing spouses.
When ACA started in 2014 his retiree insurance was in the "unaffordable" range so we've used ACA since then. Every year our options change so sometimes we've had a Bronze (very high deductible but not HSA eligible) plan, sometimes we have had the option of an HDHP with HSA. Some years there are no HDHPs available with an HSA. Last year we had a nice Silver plan. This year it's a Bronze HDHP with HSA and the largest subsidy we've ever had.
In the 5 years we've used ACA we've had 3 different insurers because plans and costs change wildy every year. And I realize that we are lucky to still have CHOICES of 4 or 5 insurers as some parts of the country have very few choices.
It would have been nice to be able to stay with the retiree plan but that would have been about 1/3 of our income. We appreciate being able to use ACA. Only 2 more years to Medicare!