PE Firm Software K-1 for Limited Partners

Does anyone have any experience with Enterprise wide PE Taxation software, specifically software or systems that generate K-1's for limited partners. My experience and observations tell me its always heavily custom Excel workbooks/models with lots of manual intervention and ad hoc rules by exception.

Its either a big four like Pwc, EY, or Deloitte working with in-house shop to crank these K-1's out. I googled and saw an intriguing promo by eFront, but I am not familiar with and have no hands on familiarity.

Thanks, any thoughts welcome, good, bad or ugly.