For 3hp, this is incredibly useful as both a sound source and a utility.
As an oscillator, it's a pretty straightforward sine wave, although the quantization switch is a nice afterthought. It only quantizes to 12-tone equal temperament, but what do you expect from something 3hp, anyways?
The slider action is smooth enough for its purposes, and I have yet to have any issues with it.
LFO mode gives you more or less the same function as VCO mode, except in the sub-audio range.
My only complaint with this module is that when in CV mode, the input port is disabled. This would have been a great chance to use the module as an offset generator, or even a quantizer. It comes off to me as a lost opportunity to really take this module to 11.
Still, at about $130 and 3hp, you can hardly go wrong.
Just make sure you have some +5v running to it...