I wouldn't recommend the Chord Buddy unless you have a serious issue with your left hand. Injury, illness, etc.

It's kind of like saying, "I wanted to get good at jogging but it made my feet hurt, so instead I drive my car around the block for exercise."

:/

At least it doesn't strum for you, too.

I recommend not using these sorts of gadgets and just putting in the practice time with your left hand. The rewards are much higher, and there's really no shortcut to building callouses, strength, dexterity.

-Carl.