I will definitely be buying this add-on too! Blender is incredible but has always been pretty weak in the area of particle systems and that’s one reason why people stick with 3DS Max and ForestPack for architectural design. This could be the start to a change in that and I look forward to seeing how the Blender developers react to this add-on. I just hope they change the underlying particle system problems that you’ve found so far so you aren’t so limited in what you can achieve. When the Blender developers see what you’ve done I think that it will put a fire under their butt to make up for the weaknesses of the present particle system so you can take this even further!
Blender is already absolutely incredible so this will be the next step on the path to taking over the DCC market for Blender. What you’ve done so far is nothing short of amazing and I look forward to watching how this develops.
Keep up the amazing work!