I've gotten lots of complaints about them. Be careful to read the fine print! They charge $100 cancellation fee even when the cruise line does not charge one.
Like other online sites whose advertisements are misleading, they advertise "every cruise on sale every day" when they sell the same cruises at the same price as everyone else.
Nothing special - just dealing in quantity.
Best to look for a reputable agent you feel comfortable with and have trust in.
47 Cruises & Counting! Favorites: Paul Gauguin to Tahiti: Uniworld River Cruises in Europe; any of the Celebrity Solstice-class ships; Holland America for 12-nights in the Baltics & Russia; RCCL for 14-night Greek Isles, Turkey, & Croatia; Holland America for 14-day Alaska cruisetour; 10-night Canada/New England cruise; 21 days in Hawaii including a 7-night NCL cruise; Oceania for 25 days in Asia; & 3 months touring Europe by train. And many days spent in all-inclusive resorts!