3 years is awesome. We got 18 months, retired at 58.5. Now on ACA and not too thrilled, premium is lower but deductible is higher, out of pocket is higher and Anthem is not nearly as good as Cigna for COBRA was. denied my knee shots, they won't allow more than 30 days of medications(we did get a vacation waiver to get an extra 30 days).
On the cost, you probably know it but realize premiums are set on income, so if you have cash in CD's or savings accounts withdrawing from that does NOT count as income. So you can lower your premium by keeping your income in the "sweet spot".In our case it's easier because Lucy isn't 59.5 yet so she can't withdraw penalty free from her IRA. So we're living off my IRA's plus our combined savings and only the IRA withdrawals count as income. Our only other income is interest from CD's and savings, and then some company stock she sold.