Meh... personal experience only is mixed. I myself do not qualify for Obamacare,or more accurately I would be stupid to try it. I get it from my workplace and have for years. I have little in the way of medical conditions except being overweight, and some inherited high blood pressure (not environmental or lifestyle caused, I went on blood pressure medication at 26)
But went through it with my mother, whom has a slew of various pre-existing conditions, including cancer last year.
She went through a 3rd party company to work through the Obamacare process. The company does not give medical insurance themselves, but acts as a go between for people to find insurance. They existed prior to Obamacare, they've been doing it for far longer than that, a number of years.
The government website had/has multiple issues. Many are publicly known, some are downright hidden unless you happen to hit them. This company had problems with a lot of its customers when going through the government site, not for helping the customers get insurance per se, but in helping the customers find the list of qualifying plans and what their subsidy would actually be.
Her particular situation was complicated by the fact the site has problems with anything other than plain vanilla cases in regards to health, taxes, and living location. For example at first it refused to accept her at all and process the claim because currently she is living with me, but owns still her old house, as the addresses were different.
This company had to get on the phone with a rep a couple times to get these issues straightened out.
Now that she has actually been on it some 4 months, she *still* has to call in her monthly payments to the insurance company, not because there is a problem with the insurance per se, but the double backlash of the insurance company going through the site for the subsidy, combined with the huge influx of members because of it, has insured that the billing process is horribly out of cycle. Meaning if she waits for the bill to come to the house, it is already too late to actually pay it.
Now, having said all that, the insurance plan she got on, actually is pretty good, and while before the subsidy is comparatively high, given her conditions is reasonable, and with the subsidy, is quite affordable for her.
While the 3rd party my mother contracted was actually pretty nice, the fact she had to go that route at all just to have a person for oversight and act as a mediator or problem solver for the site speaks pretty badly for the competence of the people running the site.
IMHO, what the government *should* have done, was either contract or partner up with a known health insurance site specialist to at least set up the site, ideally a independent one, yes they do exist. Such as the long running site eHealthInsurance.COM, whom I used for finding health insurance back in 2008 when I was out of work. There are a few other companies to come to mind that probably could have done it as well.
Are there better/worse experiences... I've heard there are. Do I think it works... as said, mixed bag, I cannot argue my mother got a good health insurance plan, but the process was not remotely smooth or easy. The benefit of a government site sounds great, but is defeated by real life experience requiring call ins.