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They are cranking in 300 users per server. So, it's no wonder they need a very strict policy on the use. For 80 euro, it seems a fair deal, but if you see the price of the next option which is nearly 10 fold, then you should be worried. I think they like only static html pages and no scripts at all.
I'm with alfahosting.be, but for rather small visitor numbers, so I can't tell you if your site would be problematic, but I think not. They do have 'unlimited' bandwidth for a comparable price as yours.