If there is a free synth which can be compared to the top notch hardware like VIRUS or NORD LEAD.
No other free VST has such distinguish hardware analog temper and sound .
Many times i prefer to use simple construction preset and unbelievable sound from this less than 1 MB amazing VST than to start complex work on complex synths which may or may not sound 'right' in the end.
It is so inspirational working with it you can make entire composition just until you look for something else.
And there is so many free presets made for it, you just have to sort what your mix need or the ones made by advanced designers if need something 'pro'.
Quality of filters is so high i often find myself stoping top rated commercial ones to try how same track will sounds with TAL NoiseMaker.There is limitations but where sit well, actually can sit better than some of most respected VST synths.