Yesterday I tried it on 7 computers for a total of 10 hard disks. I suspected one of them (in fact I was replacing it), but Disk Utility (and SMARTReporter) said S.M.A.R.T verified (though it didn't pass Disk Verify). This utility clearly marked it as failing, showed that it had had a lot of errors (consistent with what I suspected). It also revealed two other HDs with problems.
I would like it even more if documentation where to explain some of the attributes, the relationship between Value, Worst and Threshold, etc.
I recommend it.