25.5" scale isn't exactly right for a phin (should be 22"-23"), but this phin+ works - you just need to put your finger closer to the frets on the really wide spaces or it could buzz out. This was a prototype to see how a full-scale guitar did with 7-EDO. If none of that makes sense, I'd recommend not buying it. Best for experimental musicians who want something weird. I'm not gonna answer a bunch of questions about it cause I'm burnt out on society.