I really LOVE this plugin
I have been using this plugin since it came out which was at least a couple of years ago. What I love is the sampled sounds are so rich and authentic, but the interface really lets you tweak and modify sounds and layers to the point you can come up with some really usable variations and save those as your own presets. The other thing I really like (in comparison to some other sample based plugins) is the presets aren't distracted by crazy plugin effects that you end up having to undo. Instead, you get the purest of sound in the spirit of the original hardware synth and then you are free to do whatever you want from there.