Sororitas are stupidly OP atm, i play sob and i wont play them at my local until everyone has good lists built and understand the game better.
Repressers are basically open top Rhinos think about that for a minute, then the army has Ynnari SfD rule basically..... (You have to use it at the start of the turn tho).
I had 4 units of Dominions, 2 Flamers 2 Melta, I started 12" on the line, Scouted the Repressors (4 of them moving addition 10" before turn 1) move teh Meltas in Range and had 2 units shooting 10 Meltas (thanks to combi) and killed a Storm Raven, the 2 Flamer units moved and shot 10d6 flamers and killed a squad.
My Retributor Squad did use AoF with HB's behind a wall with a Canoness for Re-roll 1's, 4 HB's shooting 2x at a Devastator squad killed them easily.
He killed all the Repessors then i got to use my AoFs on 7 meltas and 10 flamers with 2 HF's, 6 Storm Bolters (he killed a couple flamers and SB's) i tabled him by turn 3.
I played REALLY bad too... I lost a few units for no reason b.c i miss played, basically only 1/2 my forced killed his army.
SoB also can ally Tempest, for like 207? pts might be 217, you can DS in 11 guys, 8 with Plasma, overcharge them and get either 2 shots or re-roll 1's, (I think you have to pick 1 of each, lets say you do) they are in Rapid fire range, that is 25 S8 2d shots and 16 of them can re-roll 1's.
The common SoB list atm is that small Tempest with 6 Repressers spamming Flamers and Meltas with 2 Ret HB unit behind a wall or in cover.
Expect to see Repressor getting a 30-50pt increase very soon.
EDIT: If i were to play tournaments to win i would take SoB, IDK if many players understand how strong they are ATM, or if the Tournaments are not alloying Repressors yet b.c the rules are not officially out.