Go online and google the paternity test and see what others say about it outside the "product" website. See the cons and pros written about is and then make an informed decision.
Also, did not know if this was for genealogy related purposed to connect to someone who has passed on or to confirm parentage. While I have not personally researched this matter, it might make a difference what product you use, based on the end result you were looking for.
If this did not answer your questions, please feel free to email back and I'll try to find you an answser..
Tina