I cannot tell you as much about Mesa Pilot Development as I can about other academies, but I just want to throw out two ideas to consider before you consider Mesa's program:
1. Have you ever been to Farmington, New Mexico? Well if you haven't, then I would recommend keeping it that way. Do you want to spend 2 years of your life there???
2. Do you have a college degree?
If yes, Mesa is a bad idea. It takes longer than most the other pay for training paths (2 years) because you receive a 2 year degree from San Juan College.
If no, then go get a real 4 year degree. First off, many major airlines require a 4 year degree. Second, you should have a backup career incase you get furloughed from an airline job (and it may happen). Having a 4 year degree is the highest recommendation I can give.
There is a really good thread about this called Information on MPD. It is at the bottom of page 2 (or check the top of page 3) of the regional forum. Read that!
All the other things aside (high cost, flying for mesa, Farmington, NM), the fact that their program is linked to a 2 year AA degree is the worst part of this program. I would not recommend this.