Murray Gold's music from the specials was probably the most well-crafted of his soundtracks for Doctor Who. There were many stand-out and powerful tracks - unfortunately, some appear to have been missed.
The album as a soundtrack is superb. The music is well produced and there's a wide range of material. There are cartoonish adventurous pieces (A Bit of a Drag, The Cat Burglar), powerful epic melodies (Final Days, The Clouds Pass), sad and reflective tunes (The Fate of Little Adelaide, Vale) and suspenseful climactic tracks (A Dream of Catastrophe, The Master Suite).
Regrettably, some brilliant harmonic pieces have not been released, most notably from The Waters Of Mars and The End Of Time Part 1. Those brilliantly powerful tracks which you would assume would be a must for inclusion on the album are never heard, which comes as a disappointment to some who have been waiting for such a long time.
But there are some phenomenal pieces to enjoy. Of course, there is a faithful (if rather quiet) performance of Vale Decem and a fantastic unused cue which follows in the track Vale. Both tracks are huge successes which are difficult to stop listening to.
Overall, if you're a fan of Murray Gold and generally enjoy his music, this is probably the best purchase you could make. But if you're looking for particular cues used in the episodes, don't expect them all to be included.