I personally know at least three guys that went there, and then on to big jets...including a chief pilot at a company where I worked.
This guy offered me a direct entry captain position on the 707...with me having only 50 hours on type. Of course we had both gone to PanAmerican for training...where the training was top notch.
Spartan had a very good reputation years ago...don't know about now.
Good luck with your training!
