I just got my first tier X vehicle ever in WOWS/WOT.
The tier X US Destroyer USS Gearing!
So far, she's flipping great. I have a 17-point captain in her, and all the upgrade modules. Concealment is down to 5.9kms, Gun range is 11kms, Gun reload is 2.4s (x6 guns that's 150 rounds per minute!!!), torp acceleration brings my torpedo range down to 13.2kms but speed up to 71knots, with 2x5 torpedo launchers.
She's a great Jack-of-all-Trades. She can slaughter other DD's with her guns (not the Khabarovsk though), harass enemy battleships and cruisers with her ROF, and deal out the mega damage against battleships with her torpedoes.
I'll have the USS Montana within a couple of weeks, too.