Do you just use a regular powder pan from a beam scale?
I had seriously considered one but after trying a few different scales, went with the A&D FX 300i (same as FX120i with more capacity). Here are some reviews on the EJ-123.
http://www.oldwillknottscales.com/and-newton-ej-123.html
......
All of these electronic scales has to be dead level and on a sturdy table.