LOVE IT. One of my all time favorite series. I think I have 95% of everything they sell, and Meet the Phonics is due to come out any time. MTSW 1-3 are great too. I really like their MTL flashcards too, they are EXCELLENT. Fairly decent sized, sturdy, wih a big, bold regular letter on one side and a cartoon letter on the other. And I like that they teach Special Case letters like A & G that are shown in many books.
Meet the letters is a lot slower than LF, and only teaches letters (upper & lower) versus letter sounds too, but it's a lot slower/less busy than LF with no plot. For my babies, I was hesitant to use LF until they were older because it is fast paced and modeled more like a traditional cartoon on TV.
http://www.youtube.com/v/lWxzqApg_hU&rel=1http://www.youtube.com/user/PreschoolPrep (more samples are on their youtube channel, and you can rent the full version for $4 to see if you like it before investing in the full set.)
http://www.youtube.com/v/k1mlsQWJjCE&rel=1 (towards the end you'll hear them sing their signature song.
I love them both, LF & PP.
Edited to add: Here's some more samples from their official channel from LF and their other dvds too.
http://www.youtube.com/v/TsPbIjENEWs&rel=1http://www.youtube.com/user/LeapFrogOfficialSitemyAnd here are some free flashcards to download. I cut off the words on the bottom of each and laminated them for a few friends with older kids.
http://projectsbyjess.blogspot.com/2010/09/leap-frog-letter-factory-flash-cards.html