I have Alyona and I must say I am happy with her performance. Enough so to consider Eliting her. Wish we had some sort of roster with all researchable tanks for the month, that would help a lot, knowing if I want to save up on the blueprints or use them now. Especially since the amount we get has been halved by the PoC changes.
Only downside to Alyona is her active, which unlike M3 Satan, is not up and ready from the get go, but usually activates 3/4 through the board, which really makes it obsolete for "catching up and reinforcing" you Leading HT since she can just walk there normally.
I run her with a Movement Emblem, Armor and HP. And it works perfectly. The Movement emblem gets her into the fray fast enough, and her Active gives her some short term protection, just enough to survive the redirected firepower of the enemy.

Now for her looks - Personally, to me she looks like a Slavic Goddes. No shit. ...at least as far as her basic skin goes. Her story is absolutely idiotic, and really makes you think like "ok soo....why the fuck are we fucking right now ?" Whereas the 4 first story parts make some sort of more or less dumb reasoning for you to fuck the tank, which culminates in the 5th, as far as Alyiona´s story goes, its completely off.
Her Affection artwork is pretty bad as well, and I keep using her Slavic Goddes one, coz the sheer quality of the art and amount of details plus the whole pose and theme is just bad.

So yeah, thats about it. I think she is a decent back up HT. Dont drop her first, keep her in reserves, but remember to buff her movement speed if you do so. I srsly wish they would patch her and make her skill load faster because by the time you use it, you are already in battle, and you pop it only for the defense part of it, not the movement speed one, which is pretty much half of the skill wasted. Rush tanks like these should be like Edna (M3 S), ready to pop the active the moment they are deployed and just go go go.