Converter box quality is better than my cable!!

I just went to Gridlink in Pasadena, CA to bought another 2 GLT-200 for my parents, their price has raised to $45.99 compare to when I made my first order in May but still is lower than Best Buy. GLT-200 is exactly the same as Sansonic and Lasonic which sold elsewhere for about $54.99 and it does not provide analog pass-through capability but actually that might not needed for some TV. What I setup for myself and my parents (we all have cable TV) is leave the original coaxial cable from cable un-touch and use a composite cable with L,R audio cable connect (those red, white, yellow cable) to the extra video-in provided from most TV set and when watching cable program, I just use channel 3 as usual and when I need to watch the DTV program, I switch to Video-1 from my TV remote. During Olympic period, I usually set my TV as picture-in-picture and switch them back and forth. I have to admit that the digital broadcast signal is far better than my cable quality. By the way, Gridlink they are offering free shipping for their combo set order at this time ($59.95 for converter box plus an active antenna), even I did not benefit for it but that might come thru for someone.