What are opinions on the newly released Marc Bolan/T Rex CD

For years I have complained internally about purchasing new releases of material previously released because it contains either a better mastering, or, a new live version of a particular track. How do others feel? And am I wrong to feel aggrieved? And is it with myself, or the labels? I say this with particular reference to the new Bolan/T Rex CD, which I can't wait to listen to!