There's a very big difference to me in a chord that uses open strings and one that does not. I also "learned the fret board" quite well and I use a capo at times when a singer wants a song that utilizes alot of open strings in a different key. I've used a bunch of different capos. Cheap ones give me tuning problems. The most in tune (for me) is the Thalia. The down side is it is too expensive for what it is. It winds up being worth it to me as I can use it on acoustic AND electric without tuning problems. The one I liked second best was G7. That also stayed in tunes better than a $5 capo, but not as well as a Thalia.