For two bars it better do something like 120 grey life and give me a hard knockdown on hit or leave me +2 on block, otherwise two bars is way too expensive for a V reversal.
Honestly i'd pay the cost. I'm not a fan of giving every character an invincible reversal. I think stuff like that should be character specific. Having said that if there was a system wide 'get the fuck off me' mechanic it should do just that. There's a handful of characters that wont see a v trigger if they v reversal just once. So if anything they should at least take that kind of stuff into consideration when it comes to v reversals.