This is the second time I've called with emergency related health concerns with my dogs and they have always been helpful. Emergency services are always expensive, so my first question is always 'Can it wait?'. Unlike many other night services, they're perfectly willing to ask a vet for an honest phone consultation before saying whether your animal should be seen or not.
They are honest about the load they're servicing that night and I've been told "We have several emergency surgeries set up right now. You can come it, but it sounds like your dog will be fine as long as you take them into the vet first thing."
I have never been ignored or had my questions dismissed, but I understand how grueling it must feel having a dangerously ill animal and being kept out in the cold while they rush around. Then again, that's the same thing that happens when a human being is in emergency treatment. Nerve wracking, but all hands are working on treating animals.