Do!aqua is one of the newer products lines that ADA is offering. I was talking to a carrier here in California, and they told me that this was made by ADA BUT it is not made in Japan or Germany, or the other places where the real ADA products are made. It's made in China, Vietnam, etc. I got a chance to examine that nano diffuser, and after close inspection, I did catch the flaws in it. Do!aqua had minor minor defects in it. Mostly, glass has some flaw, or the entire product isn't all even around the rims, etc.
Do!aqua is of lower quality than ADA, but the price is just fantastic! Your not going to notice much of a difference between Do!aqua and ADA, unless your a perfectionist, OCD, freak like me.
All in All, I would buy Do!Aqua, I mean, glass wear is glass wear. May it be Do!aqua or ADA, in the eyes of observers, seeing a slick glass wear inside a nice fish tank is sexy regardless. Do!aqua will totally give you that BANG for its BUCK! GO get some if you can!