At 400 you get a few epic grenades which are amazing for PvP. You can get the BOP 110% speeder, the mods you can make are crazy. I have proced the 2nd from last blue mod and it is pretty nuts.
Everyone is always going to want mods fast. Also you can make the epic grade 7 ship upgrades and there is something that ports a whole raid group to your location.
Pretty decent overall I would say.