If you search the thread on GearSlutz you might find folks trying to A/B the emu vs the original. I think the dev also had some demo sounds, but really there is no need, it is there and it is good.
Some of them are free, the basic older versions are free, the actual emulations are priced very favorably.
One thing about the full version Juno is that the controls are so smooth for a VST GUI, it really allows you to get tight tweaking and the interpolation while using a knob or slider is exceptional.