"Standard" MAC address is fine if you can also stop your mates, your kids, their mates etc putting their device on your network. It's fine if you are sure you will never want more than one on your network. (That possibly cuts out the educational market such as school labs.)
For my part, I would prefer to pay a little more to make the problem go away. The 25AA02E48 provides a globally unique MAC address for probably not much more than $0.50. (I realize end costs might be more because the PCB might need to be bigger etc.) Other microchip LAN chips also include a globally unique MAC address but at a little more expense than the 25AA02E48.
