Kanji Star has a more extensive library of Kanji and also uses the Kanji in words and allows write practicing. But you are stuck with the default groupings (mostly by grade level or JLPT level)and cannot create your own lists for practice. And to find the Kanji you want to practice, you have to read through each of the lists to find it. Scrolling through 2134 Kanji to find the one you are looking for is tedious to say the least.
Anyone have any experience with something better?