Blackbeard's liveaboard 65' sailboats out of Miami to Bimini & Andros in the Bahamas are great for the price, but don't expect an Agressor or Nekton Pilot type cruise. Consider it more like camping out instead of staying in a motel.
Your "cabin" will be your bunk...everything you take except dive gear will sleep with you in the bunk. (Your gear locker is on deck under the seats.) Up to 22 people and 6 crew share two showers and two heads. Food is plentiful and tasty, but definitely not gourmet.
You will be able to dive 4 - 5 times a day. The boat only docks in Bimini one night for some shore fun....the rest of the time you are at sea, day and night.
I found the the captain and crew very capable and friendly. You basically dive your own plan...no "excess" supervision. This I liked very much!
While a Blackbeard cruise is not the Ritz, you defintely get all the diving you want and the dives are typically outstanding. I plan on another trip in a year or so with these folks. For the price, I don't think it can be beat.