These are good episodes and probably worth the price but there are a couple of episodes missing. 'Army of Ghosts' and 'Doomsday' from the Series 2 finale feature a battle between the Daleks and the Cybermen, marking the end of Billie Piper's regular portrayal of Rose Tyler in Doctor Who.
In response to the other comment, David Tennant's last episode doesn't feature the Daleks. There is a regeneration scene in 'Journey's End' but it's still David Tennant at the end of it, his last episode is 'The End of Time', with the Master as John Simm and Bernard Cribbins as the Doctor's companion, Wilfred Mott.
But certainly this is worth the price, but it is unclear why the episodes from Series 2 are missing.