Great long range DPS with a preemptive strike that can stop enemies from moving or attacking if you killed them first.
Not great until you can get her V1 and needs a bit of micro managing so that her HP doesn't go down and her shield doesn't break, so you can get max value out of her ult.
Sniper doll so her movement is terrible, just don't bring her in extraction stages.
V1 is the breakpoint you want to use her in high endgame scenarios (frenzy boss, gunsmoke, crossroad challenges). You can consider V2 if your budget is flexible.
Nice damage boost with both mobbing and bossing. Plus the free attack after ult is quite significant as her skill point gain is quite low. If you have her built and/or V1, you should considering getting this key.
