Trance Planet is a good background trance album. It doesn't provide any distracting sounds or unexpected jumps. This stability is also the album's single problem: there are no positive surprises to draw one's observation suddenly toward the currently playing tune.
Don't get me wrong, there is nothing wrong with the album - it just doesn't provide that final kick to make it remarkable.
A sidenote: I especially liked the female vocalist's use of voice; she brings back (fond?) memories of early 90's eurodance.