Professional musicians, you are free to sit this one out. DJ space is probably not going to fill your needs. Unless you need to play god, turning the planets themselves into musical instruments as you conduct a cosmic electronic orchestra with naught but your fingertips. If that's something you've needed, then yes DJ space will serve your purposes quite nicely.
FL Studio this is not, however as the saying goes, "If you want to mix sweet tracks from scratch, you must first invent the universe." The app functions very similarly to Garage Band in that you select from pre-recorded loops of music and assemble them into tracks.
While Google's been working feverishly to build out its Play Store, bringing it to other countries and expanding its offerings, the company's music store has been lacking one crucial feature that its competitors have: library matching. Where Amazon and iTunes can scan your current collection and add the songs to your online storage, Google has, until recently, required users to upload every individual track manually. A long and tedious process. In mid-November, the scan and match feature came out for Europe, and today it arrives for US residents.
Today, Spotify's Android app received an update that should please audiophiles the world over (where available): if you're using the mobile app on Ice Cream Sandwich or above, you can now access an equalizer from the Settings menu. The features is actually called "Audio Effects" in 4.0, but on Jelly Bean it's been changed to the more readily-recognizable "Equalizer" moniker.