THe ripcord is cheaper and does almost the same things the QAD does except for a few. It will contain your arrow full even before the shot. But it won't stay up on a slow let down. It may bounce back up upon release for whetever reason, but I think you get what you pay for in this rest.

The QAD HD Pro is the newest rest from QAD so it will have all of the goodies offered by them. It will have lock down technology so the luancher arm does not bounce back up and interfere with your fletchings. It also contains your arrow fully even on a slow let down. It is up to you but I think on either rest you get what you pay for, it just depends on what features you like and are you willing to pay for them.