Panasonic 24ma 5v Relay

One of my friends sent me this link, these relays where specifically designed by Panasonic, for mcu support.

pewa.panasonic.com/assets/pcsd/catalog/pa-catalog.pdf

There on ebog here ;

http://www.ebay.com.au/itm/10pcs-PCB-Relay-Coil-5V-DC-Contact-5A-/320531246454?pt=LH_DefaultDomain_0&hash=item4aa126ad76

Has anyone used them before ?

They are good quality relays. Nothing special. I don't know if you need a transistor to drive them, or an output pin of the Arduino is enough to drive it. It depends on the Arduino board.

What makes you think that the relays on Ebay are the original Panasonic relays with gold-plated contacts ?

24mA is OK for ATmega based Arduinos, but you absolutely must have a flywheel diode across the relay coil or you'll probably burn-out the Arduino or pin. An 1N4148 is fine (good to 80mA or something like that) and ultra-fast.