Not sure what happened. I've owned these before and found them reasonably functional, at least when considering convenience and cost. BUT this last one had a SOOOO MUCH spring tension that my 11 year old couldn't even use it. The compression on the strings was so extreme that it made the guitar (every guitar) play sharp. It's fine for pkaying solo, but you can't use it for a key change on one instrument and play with another properly tuned instrument (which is kind of the point). I'm also concerned about what it would do to frets after prolonged use. I pretty much limit it's purpose for repair and maintenance work when I need to make adjustments to something but don't want to restring the guitar.