Are JIMMY JIBS reliable? What's the tilt degree limit?

[John Russell Schmidt]

I have an otherwise simple shot that requires a 180 degree tilt (maybe a bit more) that takes the camera from upside down, tilting towards the ground and back up the other direction right side up. We'll boom up and push on track in to a CU. Is this doable with a Jimmy Jib? 

Why is it that you mainly see Jimmys on TV events and the low budget stuff more than feature films, more than a jib from fisher or chapman? I realize it's not a stabilized head and operating on wheels even on a power pod head would be more repeatable but assume an experienced Jib operator shouldn't have a problem with such a shot. 

Is there something I'm missing?

Thanks