You can check my thread here for dyno results. Unfortunately I don't have stand alone results for the CAI only.
Uprev @ Zcargarage
I would say if you are installing yourself and don't want to cut your car up get the Takeda's, but otherwise I agree with DarkJak that the design is quite questionable, since you are decreasing the diameter of stock intake by shoving silicone tube through the stock opening, but I'm no CAI expert.