Psilocybe Cubensis Amazonian strain produces very thick and fleshy mushrooms. Although it is not the easiest strain to grow, it may if properly managed, produce some very nice flushes. The number of mushrooms may not be huge, the size more than compensates for this. Fruitbodies are very solid and have a massive stem.
Cold-shocking is definitely required for this one or else the mycelium will completely cover the casing and this makes watering impossible. This condition also causes mushrooms to only form on the sides of the trays (which will lower your yields)
The mycelium of this strain is extremely rhizomorphic.