As the name implies- that Radio Shack unit is just a link between source and computer. It allows the signal to be sucked into the computer so the included software can do ALL the processing. It's a software solution with no hardware encoding. Your CPU is doing all the work. I don't know Plextor's numbering scheme but I do know the 100 is not much different than other [bold]software only[/bold]A/V units. The 402 has a Phillips and a WIS chip inside to handle encode/decode functions relieving your CPU load. No matter what, the computer and capture device needs a program running to control the signal I/O. That's what a capture program does. Don't know much about ADS stuff- can't comment. However, what ever product you decide on I think it should have [bold]hardware capability[/bold] and not rely totally on the CPU. Hauppage series 250 and 350 are highly reccommended by some as are the Canopus units. Wish I had the $ to compare for myself and post screen shots.