A single with a song and loud (mostly bad) remixes is not worthy purchase for me. This here is another version of a find but (slightly) "So perfect" and three unreleased bonus tracks. So you were, 3 1/2 new tracks on the single.
The single version of "So perfect" tells me personally better than, the album version and the three bonus tracks are also very well done. Therefore strong buy recommendation!
The decision to grab the bonus tracks on the single and not on the album but I find really, because although the album include, but would simply not fit anyway in the total package of the album purely ansich. About the two remixes is debatable. I think now is not necessarily bad, but they never make it with me still with in the playlist when I play the music. One would leave them out of me and can also press for the price.