I was stationed at AF Academy. Knew a lot of IFS folks and was considering doing it for a spell in the transition from active duty to figuring out the rest of my life.
It seemed like a fun job that I'd enjoy for a while. To me it was not a career, and a career was what I was looking for.
I knew folks that loved it and planned on staying forever. The "gripes" revolved around the commute from the Springs, and the week in week out unchanging grind of the flying. Didn't know anyone truly unhappy with the gig, it just got old.
If flying 2-3 times a day with pre solo students sounds like something you'd enjoy, it's probably a good job for you.