what about mackbookpro 13" mid2012 why cannot use this feature

Check for updates and power nap will install

I also have the same issue, but there is no updates for me to install...

I understand that "Power Nap" is for Flash drive Macs only at this stage.. ie the Airs.

Updates are now available for some Macs for Power Nap.. worth checking. For MBPR at least.