It's funny watching the Zenefits response: Bring in the yComb & Celebrity Investors (Jared Leto / Ashton Kutcher) to get public opinion on their side via twitter #ADPeeved and a Change.org petition. So far at least on social media there's not a lot of noise from impacted customers. Just negotiate an MSA, pay the fee, build a proper integration and perform better Risk Management in the future (like a $4.5B business should).