It can be the best price, but not necessarily the best deal. As others have stated, you could end up in a very undesirable location and you may not enjoy your cruise because of it. We cruise in guarantee cabins alot and it's a gamble; sometimes we win and sometimes we lose. But if price is an issue and you can go with the flow, it's definitely something to consider.
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!