I had bought quite a few of the older Never Clog stones but was never a fan of the "Carnival" colors. This one blends in much better and being weighted is a plus. Supposedly you can adjust the bubbles which is a plus but a feature I have not used. Love the look and the bubbles it made right out of the box. Another great product from AquariumCoop.
I had reviewed the USB air stone previously and found it to be powerful, but I thought it was too noisy over what was advertised. ACO emailed me to see what was up and they confirmed that I wasn't nuts--it was definitely a defective, too-loud unit! They immediately sent me a replacement air stone, which is working perfectly and is totally quiet. Above and beyond customer service.
They work, not expensive & adjustable, what more can you want.
I like how it is weighted and has a discrete look to it. It allows a lot of control with the bubbles and if you want them coarse or smaller. However, my wish is that it had a little more heft to it, as it doesn't seem to have enough heft to have it sit the way I would like it to.
I love it