We have carefully analized our bussiness model and we are sure it's sustainable in the long run 
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.I'd like to hear it. I'm highly skeptical of how offering free web hosting (and also allowing users to hog as many resources as they'd like) could all be run on ads in the home page.
About our premium options, yes, they are still in progress. We are currently talking with several other web hosting companies in order to get special deals for our users, shall they wish to upgrade at some point in the future.
Upgrade... to what? There are no more features to upgrade to in the first place, if you're offering unlimited web hosting.
How reliable is this?
What is up-time like?
which control panel are you providing?? cpanel ??
Both questions can be answered by trying the hosting out yourself, with a dummy site.