Does anyone know anything about these companies and their diffusers. They look decent, but i don't want to buy anything with bad quality or bad fitment. If anyone has any input on either of these pieces I'd greatly appreciate some knowledge before I buy. Here are the 2 different pieces.

Kakumei:
http://tinyurl.com/8kqyq7

AAC Carbon piece:
http://tinyurl.com/8x4xft