Just wanted to update. The diffuser is working great. I'm still dialing in the CO2.
I ordered two of the JARDLI diffusers. One worked great, the other did not. I tried cleaning the second one, but it still only allowed bubbles out of one small area. I emailed JARDLI and they refunded me my money no questions asked for the faulty diffuser. I bought a replacement and it is perfectly fine. Good customer service! I did not even have to send the faulty unit back!
Jardli makes some decent glassware. I broke my glass surface skimmer and bought a Jardli to replace it. It's pretty good quality, especially for the price.