and i have used it in the past and had no problems
just add a coupler (http://www.amazon.com/Aleratec-Female-3-RCA-Coupler/dp/B002B8WVVU/ref=pd_sim_23_4/183-0251197-5334464?ie=UTF8&refRID=1H4528XN6CSCMD2F03MA) and you're good to go with some extra RCA cables. Use the male side of the splitter on the coupler, giving you two signals going out. Connect one set to the tv, the other set to the capture card. And voila!