So I’m a VMware Horizon Customer / Engineer - I have a specific set of VMware Instant Clone VDIs that I created for a bunch of sales managers for the company I work for. They all use the iPad Pro 12.9s and they love them. They still need access to their green screen and spread sheets from a Windows VDI, so that’s what they have.
From what they report the experience is great. Make sure to use a keyboard with it and a Bluetooth mouse with it. Trust me, it’s worth it.