I work at Rainbow, as an Instructor and can vouch that Rainbow will not "scam" any money from you. I got my Private through commercial and CFI, CFII with them, and am very satisfied there. The Instructional staff are either former students, or Embry Riddle Graduates. One was formerly a 1st officer with a Commuter Airline in a SAAB.
Our 1st officer program is fairly new, and I am currently teaching 4 full time students that came to Rainbow for that purpose.
If you'd like further questions, you can email me.