Voltage Regulator Input Capacitor: ESR Rating

[gregallenwarner]

I need ~10 or something (prototype) so Digikey, Mouser is out for me.
My input voltage is max 90Vin and 5V out.
Ebay etc is only option.
1uF 50pcs 100V 13,55$
or
1uF 50pcs 50V 0.88$
So about 15x cheaper

Have you ever run into any trouble with those Ebay caps? As in, are there any issues with them not holding up to their rated specs, or early failures? Or being way out of tolerance?

I only ask because, while I do sometimes source components from Ebay, they're always for my own personal stuff, or for prototyping. Anything I send out the door is always built with parts sourced from Mouser or Digikey.