I really enjoyed the comedic value in this episode - Rose/Cassandra particularly
For 10's first real outing I think it did a good job of showing us what kind of man he was...what we could expect of his incarnation..and more so than Christmas invasion helped to move us on from the loss of 9. For me that was KEY to the continued success of the show
Doctor - I like a little shop.
Cassandra: It's goodbye trampoline, hello blondie!
Cassandra (in Chip's body): Ooooh, sweet Lord. I'm a walking doodle!