Being able to be taken by every faction, the Void Shield Generator is probably the best points you can spend for your army in 8th.
It's a bit less then double the old cost in points, and so completely worth it.
The stats are T8 18W SV 4+. Combat hits auto-hit, and assaulting units don't get protection from shooting.
It still has the same 12" bubble around it. Any shot from outside the bubble to a unit inside the bubble gives an invulnerable save.
It starts at 4++ until it loses half wounds. Then 5++ until it's down to it's last 4, and it's 6++
With a lot of assault armies being super fast, the return on this will vary from game to game, and will work best protecting a gunline itself.
I plan on using it a lot, especially in a Loota heavy list.