Reading the FAQ's, it seems that
- You don't need to pay anything for the trial
- Sign up for the trial and hit confirmation link on the email within 72 hours, if you don't confirm you won't be considered for the trial.
- Success(ful) applicants are expected to test the new product and give us unbiased Trial Report based on the quality, workmanship, functions and massage effects including the suggestions about the improvement. The Trial Report should be submit promptly, or it would affect your future applications on new products.
So I guess it is a kind of competition where you'll have to give feedback after receiving the prize. However even the feedback is optional, there's no onus on you to actually submit any feedback.
This appears to be an offer to trial products not a competition?