Snack Machine for noobs (noobies)?

[UncivilBeast]

So I am new into vending been doing drink machines for a year now. 2 of 3 machines have working nayax readers, however we are interested in a snack machine! Keep in mind I will have to learn them, but what should I check while getting used or "like new" snack machines. 

[Southeast Treats]

Be sure the VMC version will support cashless and DEX.  Older machines such as AMS Sensit 1 or 2 can be too expensive to upgrade.  USI machines using boards prior to GVC 1 or 2 usually won't DEX without an aftermarket board, and sometimes have issues with cashless.  Of course, test all the motors and pay attention to the sizes of the spirals.  I have had issues with too many smaller width spirals on older machines (made when large size chips were not common).  Spirals can usually be swapped for larger sizes but of course that comes with a cost.