I'll give my thoughts on it when I am able to buy it.

I performed a simple test, and will try to post here the screen capture later on.

1/ I have a well defragmented partition
2/ I use "Scramble" from Raxco to create a very fragmented partition
3/ I use LaceDefrag on this partition
4/ Most files got defragmented and regrouped, but not all.

So it does defrag !  It's not an optimal defrag like what would PuranDefrag do.  Regarding performances, I not really sure on how to measure is the Lace Index is really correlated to some aspects of the performance.

Well, it turned out to be user error that wasn't letting me use the license. I just ran it and it took 15-20 minutes to do a defrag on my 250 GB SSD. It seems that it helped speed up the loading of programs, etc. I'll restart and edit it after its done in case the booting process is faster because of it.

EDIT: It has sped up the boot process by a couple of seconds.

Well, it turned out to be user error that wasn't letting me use the license. I just ran it and it took 15-20 minutes to do a defrag on my 250 GB SSD. It seems that it helped speed up the loading of programs, etc. I'll restart and edit it after its done in case the booting process is faster because of it.

Defragging a SSD? Bad idea. Unless the SSD sucks, you aren't going to get big benefits from it, and you'll be wasting your precious limited erase-cycles for no good. Speeding up the loading of programs? Perhaps because the defrag caused stuff to be loaded to the filesystem cache

EDIT: It has sped up the boot process by a couple of seconds.

Quantifiable or gut feeling?

Here is the first result of my test :
F: after a "regular" defragmenter
F: after Raxco Scrambler
F: Lace Level after step above
F: after LaceDefrag (1 time)
F: Lace Level after step above

Subsequent LaceDefrag executions improve the defragmentation further, and after 4-5 times, it won't change anything.  LD apparently thinks that the performance is now good enough (it's also a beta version, their main product being LaceLevel2).