Albins are located about an hour west of Melbourne where i am, in a town called Ballarat. From what i understand, they actually started making various gear sets for different forms of motorsport, primarily circuit, drag and of course off road and buggy racing. Ballarat is fairly hilly and rough so charging around the bush up there is a good testing ground for this sort of stuff. They have been doing this for at least the last 15 years that i know of. obviously making things like VW beetle and Kombi box upgrades, then stepping up to Porsche boxes and then finally into making their own boxes. A few years ago they got the initial contract to supply the V8 Supercars race series with the rear mounted trans-axle for the car of the future project. This was a contract to supply the whole grid of cars with a bespoke control gear box. Series is powered by v8 push rod engines predominantly, in the region of 600Hp, normally aspirated. around a 10" slick on the rear, car weight is probably around the 1500kg mark, they are big full size 4dr sedans, or they were at the time. circuit race series, turning right and left, tarmac track with some rough curbs and typically a bit of contact.
So based on the above, you can assume that Albins know how to make a decent gearbox.
MacG racing in the UK have been using one in their Ultima race car