My old HD did not work well and I figured it would not be worth sending it for repairs, so I bought the new HDC model. It has the same features as its predecessor and now includes the metronome, more memory and "sweetenings", a timer (useful to time songs or sessions) and a better user interface. The presets are gone, but the unit remembers the most recent sweetenings used. The color is fun! You can assign a color to each sweetening and you can see which instrument it is for when you select it. The battery lasts for many hours before needing a recharge. The online editor works better with this model than the older one. A bit pricey but hey, this is a serious tuner! On my old one, the selector knob sort of deteriorated over time, not sure if this one will have the same problem. So far soo good.