If I was buying used I'd look carefully at the following:
1) String condition, fraying, etc. A new set will run you over $100
2). Carefully check all edges of every limb for separation, splitting, fraying, cracks, etc. Running Your finger along each edge will catch on any minute issue. I've seen composite limbs develope separation in their fibres with age or abuse.
3). Check the spacer/bushings between the cams and the limbs. Sometimes these break with age or with a dry fire. There should not be a sloppy gap between the cam and the limb.
4). Although harder to detect, check cam axles for straightness. Bent axles usually mean a dry fire.
I'm sure I've missed stuff. Others may have more ideas of what to look for.
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