Rands Air were once state-of-the-art orchid pots, around 25 years ago, and they are still damn fine pots. But many newer designed pots, incorporating air cones and side slits and heavy drainage, have saturated the market, making the Rands pots not as unique and hard to find nowadays. But I still really like the Rands for phrags/paphs. The square design holds more media than round pots and therefore dries out slightly slower, but doesn’t stay too moist. For some orchids, like my Phrag pearcei which is over potted in a 4” Rands (which unlike 4” rounds is a fairly big pot), it’s a great combination for keeping roots moist longer, requiring less watering.
One annoying thing about Rands is the jump from 3” to 4” sizes is huge. I’m often in the situation with Paphs were the 3” pot is too small, and the 4” pot is too big.
I was introduced to Rand’s Aircones at an orchid show within the San Diego zoo around 25 years ago; I noticed that most of the blooming Paphs/phrags were in these pots.