The Crucial Firmware page has this warning:
"UEFI-based Systems: During validation of this firmware update we noticed instances where our update tools do not recognize the SSD with some systems using UEFI........"
Some folk on the Crucial forum are assuming this means you can't use it on Macs, but from the number of successful updates here that must be wrong.
That just means the ...
update tool do not recognize the SSD..., not the Mac itself.
(Sorry if I came late to the thread and it's been answered. Just hate to read the last chapter first... ;-) )
Btw- I just last night installed a 512GB M4 in my Early 2009 17" UB, firmware 000F and it's running fine (though I haven't done a lot with it other than near simultaneous launches of main apps - like launch Pages, Numbers, and Keynote as fast as I could off the dock and. The time I got to pressing the icon for Keynote, the others were tapping their virtual feet waiting on me (always the criteria for needing more horsepower, i.e. you want the computer waiting on you, not the other way around).
Black Magic Speed Test:
218.4 MB/s write,
270.7 MB/s read (using 5GB file).
Pretty much in line with the command line "dd" tests I ran which were (all the following tests were based on those command lines (search here or google for the strings))7777:
227 MB/s write, n/a on read, as the results I got we're cached and I left it at that.
For my Seagate XT Hybrid, 500 GB, the following results were had:
71.6 MB/s write, 78.9 MB/s read (4k blocks, count of 1024)
I had seen 88-90 MB/s average using Activity Monitor's Disk Activity using a 1.22 GB file. (I've been running this drive 24/7 since 9/21/11.)