TJM is a competitor to ARB over here except thet their stores do fabrication and custom work whereas ARB just sell their own product. When I was shopping for suspension, I nearly went with TJM but opted for the Tough Dog adjustables which were a bit more expensive after the TJM salesman admitted they were better than their own brand. I did not want to go with ARB after numerous reports of sagging on this forum.
Go with the TJM at that price you can't go wrong. Just take the time to get the right rear leaf spring for your application. There is usually three types: Comfort ride - soft 100 kg constant load; Medium Ride - 300 kg constant load and Heavy duty - 600 kg constant load. I made the mistake of going with the soft springs and had to upgrade them to the comfort ride which cost me an extra AUD $100 (say £50) as they had an extra leaf in them. No wanted to sell me the heavy duty ones unless I was a bricky who carried really heavy loads all the time. Over there, you might find it harder to get swapped stuff over.
It is frustrating for us to see people overseas to be quoted prices lower than we can buy at in the country of origin.
Go for it Marnius!