Depends, if you already have similar modules like Plaits or Rings and don't have the Mimeophon or Desmodus then go for the effect module. Picking between Mimeophon and Desmodus is more difficult which is why I ended up getting both. Mimeophon can do more but Desmodus is way easier to use as a beginner to modular. All three are great modules! I have Plaits, Rings, Mimeophon and Desmodus and now I really want Beads aka Clouds v2 so that I can feed it into Rings for the old muff wiggler meme.