We use Octoprint as well, but it didn't meet our needs. We needed makerbot support and connecting multiple printers to one Pi. Cloud slicing was an obvious answer to us, and allowed us to provide a common API for these printers.

I can send you a pre-release demo if you are interested.

No thanks, I prefer open source for my open source printer, and esp. dislike the idea of relying on the cloud to make the software work.