Pros
Many of the people are great: very intelligent and talented. There's too much politics and red tape, but despite that there is a level of respect and professionalism maintained. Compensation is good, as is the work/life balance.
Cons
After the integration of Pentaho with HDS, a lot of the Pentaho team jumped ship or was laid off. There was no effort made to keep the Pentaho team around, despite the fact that HDS is now trying to sell software and the Pentaho people are the only ones who actually know how to do that. None of the Pentaho folks who departed were backfilled. Budgets, T&E, and staff were cut without explanation. There is no tangible product that Hitachi Vantara is selling as of yet. It's a lot of handwaving and lip service. There's a reason why there are no actual IoT case studies on their website.