Hi Jayanubian and welcome to the forum!
YCCR DVDs are excellent, my son enjoyed watching them too! If you are interested in LR, it's the perfect time to start using it, because:
1- at some point, your son will be done with the DVDs (though you may show them again once in a while for review, but not too often, as he may get bored)
2- you can show him the LR curriculum for review AND learning new words that are not in YBCR & YCCR
3- LR will offer endless learning opportunities, you can download hundreds of files from the LR library to teach Encyclopedic Knowledge, languages and more English vocabulary (
http://forum.brillkids.com/downloads/?overview=1 )
4- you can create your own lessons especially with the new version of LR that is FANTASTIC! You can find more info here:
http://forum.brillkids.com/announcements/update-to-little-reader-v3!/
Regarding LM , my son enjoys it a lot for the moment though he didn't really wanted to watch it at some point. I just changed the icons according to his interests and always put the female voice

now he loves it!
Concerning LMs, we watch several lessons during the day, my son always asks for it and I can see he did a good progress in just a few months.
I hope this helps!