Got a 50cc50 Saki and I'm quite happy with her.

She's great for some maps where your team is slightly too weak or the necessary strategies a bit too complicated so you want to assassinate some big mobs. For example the Mummy King of the last map Undead Swarm. Place Saki to the left of your gateguard and when the big mummies arrive I activated her Skill

She assassinated 2 big mummies and a lesser vampire so I didn't have to place any blockers on the left hand as my dps was high enough to kill the rest of them (or tank them) with the other units already placed.

Since its RNG heavy she's not somebody you imo want to use on a map which you can clear easily otherwise, but if you're willing to try twice or so to 3 star something she's great.

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to the left should have meant to the right...

guess I should register so I can edit my posts -_-

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neat.... you can edit your posts somehow even when not registered