If any HNers are looking for a cheap entry point into the style without spending $250+ on a beautiful bunch of laboratory glass ware, there's the puckpuck[1], which sits on top of an aeropress and turns it into functionally the same device as the Yama towers - slow controlled valve dripping cold water at a controlled rate onto a bed of coffee and a paper filter over the course of hours.

I've found it a nice way to play with the style without investing the money and space. Still want one of those towers if I ever see them cheap though.

[1] https://puckpuck.me/ - no connection, just a customer.