It's been a long time since I was a UPT IP, but I always had a simple hypothetical for the tanker guys I flew with that were debating the assignment. You can adapt this to whatever your current airframe is.
If it was a Wednesday, middle of the day, and I came to your desk and told you that I had a pattern only sortie about to step, and you had no beans left, no requirements, nothing in your desk job that required you to skip the flight; basically, if you did it you would be doing it for nothing other than to hop in the plane and fly a little. It hasn't been a while since you've flown, and you haven't been flying your ass off. Just... Do you *want* to fly?
If the answer to that is "hell yeah," then you're probably going to enjoy UPT.
If you're the guy who would rather use the time to catch up on some low priority tasks, or maybe hit the commissary so you don't have to after work, or whatever other simple life and career tasks we all have, then it's probably not for you.
Bottom line, if you just fucking love flying airplanes, it's hard to get a job as good as upt. If flying planes is just how you pay the bills, then moving your family to the least exciting cities in America is probably not going to be particularly fulfilling.