I don't know where all of this is coming from to be honest, when I kitted out my Navara, I got three quotes, two from TJM dealers and one from ARB. I did a lot of homework, and personally looked at all of the stuff I was going to buy before I made my decision. All three prices were in the same ballpark, in fact ARB was the middle price, despite being better design & better quality (in my opinion). I tried to get ARB to match the price of the cheaper quote I got, but they stood their ground. As someone who spends every day tendering various projects, I commend this, and I commend them for having faith in their product and services enough to stand by their price. I do the same thing in my game because I know the solutions my company provides are top notch, and I will not price match some backyard electrical contractor who can't deliver what I deliver. And guess what, clients who appreciate quality and service will choose us, despite price.
When I got the equipment fitted, I found their service to be great, they did a very neat job of the install, and the products are great quality. Sure some other manufacturers may be "cheaper" but more often than not, we are not comparing green apples for green apples.
From my experience, I can't see any reason to say anything other than good things about ARB, but I guess that is only one experience of many. Spending $5000 on a handbag is stupid, spending decent money for good quality products or services is not.