My apologies if this is in the wrong spot, but it sounds like the right place to me. We are doing a few songs that necessitate my dropping my E string a whole step to D. I know that a detuner key would be a good way to go, but I'm trying to do this on the cheap. I've been looking at Intelletouch tuners, but the battery compartment seems to have issues according to some reviews I've found. Korg makes one that looks promising, but it doesn't have a back lit display. That could be problematic. There's one by Seiko that's intriguing as well. What has everyone's experience been with these things?? Are they worthwhile, or a waste of money??