You will have 2 big high-speed catamarans every day on this route plus a conventional ferry on Sundays (this one may change as it is not yet published). Availability should not be a problem because the overall passenger capacity has increased massively compared with just 2 years ago. However, the route is popular with day trippers from Crete and there is always a risk that the one you prefer may sell out, or only business/VIP class tickets will be available at a considerably higher price. August is meltemi season, so on some days the service may be cancelled due to rough seas.
You can always get your ticket in advance when you arrive on Crete.
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