While the .03 update of Apple's much-discussed 7.x iOS fixed many performance issues, it was simply better--not the baby-smooth operation that users experienced with the mature iOS 6.x. Version 7.04 builds upon that (I swear version .04 is smoother than .03, though that may just be my anticipation of the upcoming 7.1). But more importantly, it also fixes a major security flaw that could have had users getting apps without actually being signed in to the store. Good for the users perhaps, but not so much for the vendors.