I avoided buying used, until I decided to take a chance, so far, half a dozen, I have gotten lucky.
If just starting out, and you want new stylus with new suspension?, better imaging specs, lighter tracking?
you can put a new stylus on Many Old discontinued cartridge bodies
https://www.audio-technica.com/en-eu/support/which-stylus-can-i-use-to-replace-my-discontinued-model
scan the list, right side: Any VMN model can be selected
check the left side, research the original specs, wide channel separation some up to 30db and nice tight channel balance, many 1.0, some 0.5db, they work together
from a seller I recommend and bought both an AT150E and an AT160ML from, both with good used Microline on Beryllium for under $300. And both came with the Magnesium Headshell with both azimuth adjustment and overhang adjustment.
$60, no stylus AT150E body
now buy a new VMNx Microline Stylus on Boron Rod for it for $260.
https://www.audio-technica.com/en-eu/cartridges/styli-accessories/a-t-moving-magnet-styli/at-vmn45xml?_gl=1*1pfvgnd*_up*MQ..*_ga*MTYxMDAzNjA1MC4xNzYyMjc0NDA4*_ga_9B1Z5FDEW6*czE3NjIyNzQ0MDgkbzEkZzEkdDE3NjIyNzUzMDIkajYwJGwwJGg5ODEyMjY3NQ..
Now, $320. you have NEW SUSPENSION, NEW ML on BORON ROD in a body with excellent Imaging and sound quality. Even better Imaging specs than an all new 540 for $280. which is tapered aluminum.
Of course, they have to sound good too, they do!

