Pros and cons to running Vahl in 1000 points

Hey everyone, I'm new to 40k and building a sisters army. Obviously gonna start with 1000 point games until I can get 2000 points, but I'm wondering if it's even worth it to bring Vahl in a 1000 point army.

I've got the combat patrol and some Paragon Warsuits and I'm building off of that. I'd like to add some seraphim and an immolator as well.

So yeah, is Vahl worth it being 20% of my total army cost? Will people get upset if I show up with Vahl for 1000 point games?