Yes they do... I am investigating this right now. I did speak with their gateway "experts" and they explained that they use Authorize.net and their rates were not bad but not as good as the post above this one. I asked these folks above in portland maine to give me a call. I use Magento for an eCommerce store for other parts of my business and it would be good to not depend on Paypal and Google checkout.
Now if we could have a way to export files that are Quickbooks compatable then you really have a nice fully integrated system using all the major platform providers.