There is a bit of repitition in the Little Pim (like at the end of each segment they go through the words again but more quickly) - but it also builds on information given.
If you go to the website and you can get the companion guide and transcripts for some of the languages eg. chinese, russian etc. Have a look at the transcripts and see if you're happy with the amount of repitition.
http://www.littlepim.com/for-parents/companionguides/My DD LOVES Little Pim and gets excited when we put it on. We don't get the same reaction to YBCR or Baby Learns Chinese!! As she can't talk yet - I'm not sure how much benefit the DVDs have been.