I have two pre-loved items (a Fendi spy bag and LV Mono Keepall) and, although I am 99.9% certain of their authenticity, that 0.10% constantly niggles at me, and I don't feel quite the same when I carry them. So, unless there was an LE that I 'had' to have, I don't think I would buy pre-loved again. I do think the authentication section of this forum is brilliant though.