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Open enrollment starts for Obamacare today and there's growing anger over premium hikesby Circa News

The Affordable Care Act's open enrollment period started with even more controversy: Sharp premium hikes for some enrollees are making the health insurance plan even more divisive.

Many customers are going to have to pay more for their insurance. But just how much more they'll have to pay varies wildly by state. USA Today reports.

In Arizona, the second-lowest-cost Silver plan -- the benchmark plan that determines subsidy levels -- will cost 116 percent more. In Indiana, that same plan will cost 3 percent less.

Good news and bad news users also have fewer choices of insurers. The Associated Press reports one-third of U.S. counties will only have one healthcare provider. Healthcare giants like Aetna and Blue Cross Blue Shield have pulled out of some state exchanges.

The good news? Federal subsidies also increase, so few people will have to pay for the premium boost fully out of pocket.

"Rising premiums get all of the political attention, but lack of choice between insurers could be a bigger problem for consumers."

Caroline Pearson, senior VP of Avalere

The rising premiums have drawn criticism from Obamacare critics like Donald Trump, but experts like Caroline Pearson of Avalere Health, a consulting firm, say the lack of choice among providers could do more damage.

Some posted photos of their new premiums, outraged at the price hike.

Meanwhile, Hillary Clinton's campaign has said it will focus on "fixing what's broken."

Trump has echoed Republican rhetoric in saying he will repeal the Affordable Care Act.

The Associated Press contributed to this report.