Gulfstream does offer a great program, and i know man people who have gone and have nothing but good things to say about it. They've all been hired on to other regonial airlines now. Many of them had 3 or 4 job offers before they finished their 250hr period. However, tied to gulfstream there is a negative stigma with it in the industry because it is a PFT. Gulfstream will get you to a regional job faster than instructing, and it will get you better experience as far as the 121 world is considered. But there is also some great things you'll learn by teaching. Its up to you