"Aren't customers concerned at all about local warranties and support?"
Nic, good question.
As an example, Hikvision has over 200 employees in North America - sales, support, engineering, trainers, marketing people, inventory in local warehouses, etc. It's a lot like Axis but just 30 - 50% lower price.
So, yes, traditionally, those prices came with poor to no local warranty and support but Hikvision has broken this model. How long they continue to do this combo (Western support and Chinese off the boat prices) is a key question. I don't see how this combo is sustainable since the Western expenses (200+ local employees, etc.) are the same for them as they are for any Western incumbent.