I gave it a try. Took quite a while to go through all my files on two hard drives; not sure how long because I set it to run and went to bed after it had not finished in an hour(about 100 gigs worth of data-mp3's, pics, etc,all duplicated). Had to turn off SETI because it kept stopping the index.
I found no spyware in the program from Spy-bot or Ad-Aware.
I was amazed at how fast it was in searching for files-took only seconds to find stuff after starting to type a file name. Unlike Google's prog, this one covered all kinds of filetypes.
I've since removed it; might try it again after I format.
One note: you can't use the cpu for anything while it does it's initial indexing.