For a start, there's no translation for the game, so if you go for it yourself and want some assistance, then you'll need this Trophy List from PlaystationTrophies, a roadmap for all the Trophies from PS3Imports
and the Japanese-language Wiki for the game. Also of assistance to you, due to the fact that these are
hidden deep in the Playstation Store, are the links to Bokura no LIVE kimi to no LIFE and Snow halation. Finally, so you can have a taste of some of the DLC you'll never see, here's all the shop-specific pre-order nonesne (in order, Sofmap, Animate, Gamers Online Shop, Wonder GOO, AmiAmi, Imagine Webshop, Loppi/Lawson/HMV) and here's KiRaKiRa Sensation!, including the correct outfits, even. We hope these resources help you, budding idol producer.
Next, you will note that this review focuses solely on Volume 2: BiBi Unit. Much like The Idolm@ster: Shiny Festa on PSP and iOS, there's three different volumes of the game, and the one you pick determines which characters you get for the live features, which ones appear in the room mode, and the five extra songs you get (one for each member and two versions of their group song). To give a tiny bit of credit, they are themed after the three units the group were divided into anyway... But it's still pretty expensive to get all three. Volume 1: Printemps Unit has Honoka, Kotori and Hanayo, Volume 2: BiBi Unit (that's ours) has Nico, Maki and Eli, and Volume 3: Lily white Unit has Nozomi, Umi and Rin.
You can also transfer data between the three, as outlined on this page on the Japanese Wiki for the game. By doing so, you unlock 10 Link Missions (exclusive missions in Live Mission mode that unlock new voice clips in the Club Room) for each game you link for a total of 20, and anything you unlock that's shared by all three volumes (storyline routes, sub-scenarios, missions, songs and costumes) in one is automatically unlocked in the other, and characters from the linked volume will appear in the Club Room mode. However, there's no way to have all the characters and all 15 volume-exclusive songs in the one game. So, if you wanna get your Washi Washi on, you must play Volume 3, and to get your Harasho on, it must be Volume 2, and never the twain shall meet.
... So why did we go for BiBi? Our research into which of the three versions to get was long and intensive, but in the end, we figured our choices were 'the one without Nico or Maki' (Vol. 1), 'the one with Nico and Maki' (Vol. 2) and 'the one with Rin' (Vol. 3). So, we went with Volume 2. We're not getting the other ones.