extremely tweaky. my main pain point with it is that it sounds totally freaking awesome the first time you listen to it... I mean, incredible. Then you realize that you can tweak it more (especially VTA, but I can hear differences in .05g VTF for example) and you start to dial it in for a particular record (recording idiosyncrasies, record thickness, your current sonic preferences of the day, etc.) and it sounds even better... then you start doing this for every record... I mean, it doesn't sound bad with an average setup, but once you hear the detail this thing offers when setup just right, it's quite amazing... then there are the other models... at this point, I'd love to finish up some projects and just tweak and listen... soon it will happen, and it will be a wonderful day!