If you have it stretched straight and tight, maybe. That has not really been my experience. Though I'd say I haven't really used all that much ENT and probably seldom had it perfectly straight as possible and pulled tight. I do know if you do have turns you definitely want those turns to be rather secure or pulling conductors tries to pull the raceway at the turn.
My experience was with two project where we installed the ENT just like we installed EMT. We did not secure the bends, just supported it as requied by the code. We had zero issues with the installation of the conductors, other than pulling loops as I stated in my previous post. There were very few straight runs, and most had at least two 90s. For short runs we pushed the wire just like we would in EMT. For longer runs we used a fish tape.
The first time I saw it was actually before the NEC permitted the product because of the shenanigans by Allied Tube in keeping ENT out of the code for one cycle. It was a prison job and the door frame manufacture had installed the ENT from the door position switch on the top of the jamb to the locking mechanism. They bent it as tight as physically possible when they made the corner from the top jamb to the side. When I looked at it, I thought there would be no way to get the wires in....but the 18 AWG stranded slid right down the ENT. It was bent way tighter than even a short radius conduit bender would bend it.
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