Difference between purchase from AD and reputed seller from TRF?

[ragna93]

Hello,

I was curious what would be the downside for purchasing from a reputed seller from TRF (like DavidSW, takuya, and others).

I am not talking about buying pre-owned, but simply purchasing new ones from AD or sellers from TRF. I am pretty sure the reputed sellers from here will provide the warranty card as well, so what would be the pros/cons in this decision?

Thanks.