They are great, if you are not playing them then you are missing out on the best emotionally/decision driven game this year.
There are 5 episodes to complete the whole game, episode 1 and 2 have been released, the next episode is supposed to be out monthly, so next month, but they were late for episode 2 by like a month and a half, so within the next 1-3 months the next episode comes out. You can buy the "season pass" for $20 and get all the episodes as they unlock monthly (that will unlock episode 1 and 2 now for you to play), or you can buy the episodes individually for $5 each. Each episode is about 3 hours long and very much worth it.
"You lack the requisite spine and testicular fortitude to study under me"
"You do not know the first note of the music that moves me."