I've had the AMSA insurance for 2 years. It's really cheap, so as long as you don't get sick it's a good option. However, the benefits are very stingy and there is a high deductible and a low maximun benefit, so if you were too have something serious happen, you would be pretty screwed. Almost seems better to save the money and not get insurance (it is surprisingly tough to get them to cover even as much as you paid them), or buy more expensive insurance and get better coverage.
In my case, I have to buy insurance and this was cheapest, so I'm rolling the dice hoping nothing happens.