Having been an avid fan of the anime, and then of the manga, I felt compelled to continue on and pick this incarnation up when I saw it. I suppose I was hoping for some new kind of insight that I might have missed while watching the anime.
Unfortunately, it is a pretty clear-cut adaptation of the show, with few extras thrown in. I still enjoyed it, but I know that is only because I like the show so much. For the general fan, or especially for those who have never seen FLCL before, this is not worth your money.
It's too bad that they split this into three books instead of compiling them all into one edition, because they could have made it much more appealing to buy. All said and done, at Tokyopop's outrageous price, you would be paying $30 for one complete storyline.
Also, I'm not sure if it was simply translated poorly, or if it was written really bad, but Enokido's telling seems extremely dumbed down. The anime was particularly complex and interesting for various psychological and philosophical reasons, but the novelization took most of that away.
Overall, you know if you'll like it. And if you know, definitely pick it up. Watch the show otherwise.