Not at Miami Air myself, but a close friend is.
737-800 and 737-400 (replacing the 727) with 65-70 seats configuration. International flying, 3 year pro-rated training contract (18 or 24K ), 3-5 years upgrades. Rather low payscale, but contracted is in negotiations (don`t hold your breath).
My buddy likes it, he came from 135 and enjoys the schedule, But not for everybody.
good luck