So far I've seen nothing in ios 8.3 that doesn't work just fine. Still early, but generally Apple updates are usually fairly stable. I would only avoid them for a gig that was coming up very soon. (Not a problem for the next few weeks.) Download times were long, but install times reasonable. I've upgraded an ipad 2, ipad mini, iphone 4S, and an iphone 6. Will have a chance to work with my DL1608 this Sunday.
My Wife works in the database department of a major National Stock Broker. Pretty sure any issues there won't be related to Mackie products.