Great for me! I was able to leave my employer's high priced HDHP last year by applying via my state's exchange. I've got a lot of experience getting private coverage in the past (and being denied for pre-existing conditions--did you know that teenage acne used to be a good enough reason for an insurer to deny you coverage?) so the application process for the state exchange was a BREEZE (name, address, birthdate, income, tobacco status), even with some of the technology hiccups. But I'm in Minnesota and our exchange, MNSure, had some of the lowest costs in the whole country.
And, the requirement to cover birth control has personally saved me probably $300/year, plus the cost of my annual physical (required to get birth control, which I still think is dumb, so at least now the insurer has to pay for that).
Employer's plan was something like $400+/mo, HDHP, deductible of $3,500. The reason I've been given for the high cost is that we are in a 'group' with lots of older people, so costs are higher.
State exchange plan is $153/mo, HDHP, deductible $2,750. I'm a 33 year old quite healthy person, so I've spent about $150 on one doctor visit this year.
So now I'm able to use my employer's benefit dollars to fund my HSA and 457b. I'm also thinking that it will help us to FIRE in our 40s because our income will likely be low enough to qualify for subsidies, small though they may be.
My husband's employer premiums haven't gone up much because they self-insure, which is weird but good for us.
I also have to add that this has given me a lot of peace of mind for my sister, who has type one diabetes (insulin dependent). She currently has a great job with excellent insurance, but if her health deteriorates to the point that she can't work, she could at least get coverage and not be denied, and still be able to afford her insulin.