I've been using the Intelli Chromatic for several years now, and it's often borrowed by Fiddlers, Cellists, Mandolininists, Banjoers and once by an Appalacian Dulicimater. No problems with any of them once the best point of contact is found.

I use DADGAD a lot and as my guitar is very 'bassy' the low D doesn't always register but I just play the 12th fret harmonic and it finds it straight away.   Standard tuning... no problems.