Halls is a good program and I have met people who went through them and are good instructors now. However, there are a few other programs in South Florida you should look at too. Try and visit as many as possible. Pro Dive in Ft. Lauderdale is another institute who offers the same type of program. I think if you could visit these places and meet with as many different people as you can it would help you to make the decision. Question the job placement, the certifications, and the connections that each program can offer. I think the more you research the better off you will be. Just make sure youre getting as much for your money as you can.
If youre just curious about the program, be prepared for a lot of studdying, long days and not much time off. But to become an instructor in just a few months, you have to expect a lot of hard work. These programs are what you make of them. The harder you work, the beter you will do. Don't let anyone tell you that you cant become a good instructor without puting in years of experience. Best of luck.
Matt