Past is prologue. I really don't see how Sage will consistently respond with any meat. I suspect that all chats result in something like ""not a problem with 100c"" or ""That's complicated. Call Tech Supp."" I think it's a marketing response ploy.
As for reseller responses. Our customers on agreement all get response within their promised window (1 hr, 1-4hr, 4-8 hr). We have one who, for a while, was messaging, and it really didn't work well. We finally got him to understand he would go through less angst if we could do the problem diagnosis verbally.