Unlimited hosting claims should always be viewed with caution. Firstly because they very rarely hold true. You pay $10 a month for a unlimited account and you think they'd be happy if you used 80Gigs of space 300Gig Bandwidth as you started a mirror site for Tucows.
There is also the matter of more people will be signing up to them so their servers will probably be overcrowded and slow anyway.
Before I started a hosting company I always chose the ones which I knew had limits and said what their limits are, and I progressed this to my hosting company.
Adam
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Fyrewire Web Hosting
http://www.fyrewire.com