The "Long Ranger" is a brand, the tank is manufactured by Out Of Town 4WD in Barnesly near Newcastle. This company is also the company that owns ARB Newcastle, who installed mine.
As an auxiliary tank I've noticed two things that you could say bad about it: first, I can't use high flow pumps any more. Once the auxiliary starts to fill a little, the diesel blows back out the tube very easily. I'll mention it to the guys and see what they say about that.
The second thing is that the fuel gauge in my dash doesn't move until the aux tank is empty and I've started using the main tank (there's no switch over or anything, it just happens that way). In a way that's not a terrible thing - I was quite accustomed to the way my fuel gauge reflected certain amounts of fuel remaining, so I am reasonably certain that once the gauge reaches a certain point, I have so much distance left before I need to refuel.
The good points: plenty. It's easy, it's up out of the way, I don't need to do anything or worry about it in any way. It doesn't interfere with suspension or other stuff underneath, nothing had to be moved or adjusted. It sits close to and in front of the rear axle so the extra weight doesn't change the balance of the car too much.