Dunno if you've ever had a business relationship with Apple but they're really good on that front. Proactive and helpful, along with always trying to sell you stuff, but proactive and helpful nonetheless.
As far as identifying a bug in the software and getting it fixed, or requesting a feature, you run into a brick wall. Taking that feedback from customers is not the Apple way. This is why there is a market for third party MDM companies in the first place.