Riddle P-F-T
Well, for one thing, people believe this program to be a Pay-For-Training scheme. Read
this thread from last year for a full discussion of this "program."
As Falcon Capt. wrote above, if you have money to burn, you'll get far more mileage from it by earning your CFI. What people seem to forget about these bridge program is they are predicated on the airline(s) in question hiring. Most airlines are not hiring. If they're not hiring they have no need for bridge/P-F-T graduates. Therefore, you could go through training and your skills could be honed to a fine edge but it could be forever before you go to class. During that time, while you should be flying, your skills will erode. In fact, you might want to get your CFI during that time so you
can work and fly, which some people might regard as paying twice. If you have your CFI, you can be flying, building experience, and earning some money. I realize the CFI job market is also tight, but I'd submit your chances for finding work will be better sooner as a flight instructor.
I'd avoid the Mesa PACE program. Mesa has operated this program, in one form or another, for years. It is pay-for-interview. No guarantees.
Good luck with your decision.