TNJ is a very small Javelin. It will hold a 135 reserve and a 150 main tight. Unless you are very small, this is not a good choice for a first container at all.
The only major differences is that Sunpath has tweeked the design a bit to offer better riser protection and new options like the cut-in laterals, new fabrics and other little things. Only change I'd be intersted in is the new leg strap hardware that it to be more anti-slip. I jump a '99 Jav and there is'nt a thing wrong with it.