David,
I'm using it based on what others have seen. Check out:
http://www.west-wind.com/wwthreads/ShowMsg.wwt?MsgId=03P0U53DC
and for a test that was done with VFP 6:
http://www.west-wind.com/wwthreads/ShowMsg.wwt?MsgId=03S0INFBF
VFP 7 may have made it more consistent...

>Claude,
>
>I can't imagine that spending the time to UPPER() megabytes worth of memos and then to use ATC() on top of that would be faster than just using atc() alone. I don't really have an adequate test table to try these tests:
>
>atc( "searchphrase", memofield )
>atc( "SEARCHPHRASE", memofield )
>atc( "searchphrase", lower( memofield ) )
>atc( "SEARCHPHRASE", upper( memofield ) )
>at( "searchphrase", lower( memofield ) )
>at( "SEARCHPHRASE", upper( memofield ) )
>"searchphrase" $ lower( memofield )
>"SEARCHPHRASE" $ upper( memofield )
>
>>For some reason UPPER makes it speedier unless something has changed in VFP 7