I personally love my WDT. I got it off of a guy on Etsy for about $30 shipped to the US. He custom cut it from a piece of wood and matched it to a funnel and tamp stand.
It really helped since my Sette 270 can make clumps and overall my extractions are much more consistent with my rancilio. For $30 its probably the best upgrade I've made to my workflow.
Beginner and pro baristas share tips and tricks.