A few weeks ago I received a slushie machine:
This is not to be confused with the shaved ice "slushie" machine that sits next to it. The new machine makes nice frozen fruit juice, but tonight I decided to try a chocolate milkshake from the included recipe booklet. I have to say I am pleased, other than with huge amount produced. As I dispensed the product it looked more like soft serve to me.
Since I have so much milkshake I've decided to dispense a good bit of it into containers and blast chill it. Time will tell.
Edit: when I went to dispense the remainer of the milkshake, the texture was different. Now it was more like a milkshake than soft serve. If I want to try to do this again, I should freeze the first portion that comes out rather than the last.