This one might surprise you. I figured there was no way you could put an Organ into an EZkeys format, much less a pipe organ, but the Toontrack developers did it for guys like me who try to cobble together songs for our amusement and the part time client base.
The first thing I thought was, what about all those slide-y things and buttons? I won't be able to adjust those. Well, the fact is, I'm a bassist and a hack guitarist, not a keyboardist, so I don't really know how to get the best sounds by manipulating all those things anyway. I always grab a preset on any organ soft synth and run with it. So, figure that someone that knows how to set up a pipe organ has done that for you.
So if you are classically trained church organist, I don't know if this one is going to send shivers up your spine. In fact you might be frustrated a bit, but if you are a home songwriter and you want real pipe organ sound, this might work for you.
BTW, I was surprised at how the product reminded me of some of my favorite classic progressive recordings. Must have been more pipe organs in those recordings than I imagined.