First thing that I realised was that the controller wasn't even right side up in its container.
The controller itself feels like some parts were hastily replaced. The usual refurbished signs (discolouring+little scratches here and there),the little ridge where the front and back pieces of the controller connect together doesn't feel smooth and will scratch your hand while holding the handle. The right trigger makes the kind of sound as if it were used for years and the spring inside had worn out. Pretty ignorable stuff so far for a cheaper (genuine?) controller as I usually play with headphones on anyways.
BIGGEST ISSUE is that the controller keeps disconnecting and reconnecting (at any battery charge) for about 10 seconds at a time. This has been a problem within the first hour of using the controller and it still persists days later. Lodged a return/replacement but until then this is my experience.