EW300 IEM
Notice that they do NOT actually say it's the SENNHEISER EW300 IEM kit. It's "Unbranded." It's not even a match visually. Also, the picture is showing a frequency that has not been legal in the US in ten years. Sure, the actual unit might be a legit frequency, but can you be certain it's accurate?
Even if the unit is functional, it's not cool to support someone who has 'borrowed' the intellectual property (the model name and unit appearance) of Sennheiser.
Good gear is going to cost money. This falls into the realm of "if it sounds too good to be true, it's not."
Bottom line: If you're shopping for new Sennheiser gear, reach out to Mike Pyle or Tim Hite or myself. We'll take good care of you, you'll be supporting a fellow Labster, and you will know that you're getting real, legitimate gear. Our reputation here on the Forums is on the line with each and every sale we complete with fellow Lab members.
-Ray