UltraDefrag. is it good?

i was having a look through some of the great links i posted in that download thread and saw UltraDefrag at http://shellcity.net/
is it good? i might try it with vista.
http://ultradefrag.sourceforge.net/
http://sourceforge.net/project/platformdownload.php?group_id=199532&sel_platform=3566

 

It sounds like a nice defragmenter. If you try it let us know how it works.

 

I had downloaded it and your question reminded me that I had it, so I installed it and ran it on my 80 gig drive ( 14 gig used) and was quite impressed. I have tried a few other freeware programs and when I go to the windows defrag and analyze the disk there always seemed to be some red/defragged blocks left. After using ultradefrag there was no red.
I think I will use it from now on.
I will be interested to hear how others make out with it.