This is a nice colourful book (even the music is printed in blue!) which is designed to be played by pupil and teacher. The accompanying CD uses a Latin-American ensemble which helps in the understanding of the rhythms, and the forward encourages the use of playing from memory to really assimilate the style. In any case, these duets could be used at any stage and the more advanced players will really like them too.
NB: the printing is blue