Ive been playing Hexeris at 500 for sr4 and have been pleased with the results. Here is the list I played for reference:

Hexeris

Basilisk Drak

Basilisk Krea

Bloodrunners

Ferox x3

Venators

Gudrun

Extoller Soulward

Basically the idea is to cram all the AD down the opponents throat. While they are dealing with that mop them up with the ferox or venators. Playing a Hexeris dictates certain parts of your list as you need two things. To maximize hexeris you need solid deathbringer and death march targets. The bloodrunners and ferox make excellent death march targets. The bloodrunners butcher opposing single wound infantry and are extremely fast. The ferox can really put the hurt on what ever kills them.

For death bringer targets i have the pow 8s from the basilisks and a 9 from Gudrun. You really just need to clear out infantry and a pow 8/9 is going to do plenty of that.

The drake was an experiment in pushing models off of control points or out of the mosh pit. In the games Ive played so far that hasnt been a factor. I think the drake should be cut and replaced with a more aggressive beast like the savage.

In the game  played against Sorcha today I ran the plan exactly as i had hoped. My advance deploy kept him gummed up. I death bringered Gudrun axing a man-hunter. Then Sorcha did her thing and wind rushed and tried to tempest my ferox that were in front of Hexeris. The tempest succeeds but cant knock down the cats. The next turn the drake gets slammed into Sorcha and I mop her up.

I was really pleased with how this went but I plan on trying a new list at 500. Ive already talked about my love for Xerxis so Im going to give him a go at 500.

Xerxis

Krea

Savage

6 Cetrati

6 Cetrati

Orin

Tyrant Commander

2 void spirit