I deem that IK Multimedia iRig is awesome because it could simulate a lot of effects with iphone and ipad. It does not need amp, so you could pratise without disturbing your neightberhood. I want to say that this is not a AD.
So I just bought one from Ebay, which cost me about $20. After checking it carefully, I found that this one is a typically fake one. It match all the features of a fake irig, and the noise is huge. I returned it back to seller right away. Do you know the cost of a fake irig might be less then $5? Not mentioning the huge noise and the dangers for your instrument.
Here I list some instruction for you to differenciate the genuine one and the fakes.
Check out the website first, please:
http://www.ikmultimedia.com/MainPhp....ay.php&Id=3148
and I translate some information from a Chinese website:
IK Multimedia iRigÕæ¼Ù±æ±ð ¸½ËÍδԽÓüʹÓÃamplitube·½·¨ - ÒôÀÖÆ÷²Ä×ÛºÏÌÖÂÛ°æ - ÂÌÖÞÒôÀÖÂÛ̳ Î÷°²Ô*´´ÒôÀÖýÌåÆ½Ì¨|Î÷°²ÀÖÊÖµÄÍøÂç¼ÒÔ° - Powered by Discuz!
First and most significant thing is that the "CE" symbol on the back of irig should be concave but not convex. There should be a screw on the back. What's more, make sure that the registration card is concluded and the symbol of IK should be in red, but not all in grey.
Here are some pictures: