Yes, these songs are good (although there is no *real* bonus material, as remixes don't really cut it for me, some B-sides would have been nice, although these are available elsewhere)
The tracks seem somewhat arbitrarily chosen - yes, the singles are there, but some great tracks, most notably Stone In My Shoe, are missing - whereas The Golden Rule gets in?! Likewise, Karmically Close and Are You Jealous? are the non-single tracks chosen from Illumina - where is Air & Angels, Resistor, Going Down... And then only two tracks from their latest offering... to be honest, just buy their three albums, and leave this one unless you're desperate to have everything the girls recorded.