Since the Allen strain was discovered in Thailand by John Allen, it resembles many southeastern Asian strains.
It’s a fast-growing coloniser that produces tall, slender mushrooms. It often causes a prominent umbo (bump) in the centre of the brown/tan pileus, which is often bell-shaped (cap). It has a thin, more pliable stipe than other cubensis, which causes the fruit body to lean heavily. It has a very dark sporation (almost black).
On various sites, it has received positive feedback in terms of potency and cultivation. Vibrations in the body and slight visual stimulation are among the side effects.