Oh man, I've been loving the WotC upgrades so damn much. Supply raids feel good, stressful, but good. The glee of looking over the payouts reminds me of crashed transports in XCOM: Long War. Trains are easy enough, but the damn crate ones give my conniptions.
Killing the first Chosen was likewise difficult and satisfying, though the reward is almost too amazing. It's a rare thing when a boss weapon gets more powerful when the player gets it. The assassin shotgun is a death machine, and the sword... Well, the sword is obscene. My ranger colonel reaper'd A MEC, an Auto-turret, a purifier, a codex, an advanced officer (admittedly wounded), two vipers, and then used the last move to shotgun a muton. Granted, the Chosen Assassin would be incredibly (stupidly even) frustrating if she actually operated on the same level as a ranger.
Reapers are still my favorites, by far, over Skirmishers and Templar. Mox is a colonel, and he's neat and incredibly useful for undoing your own fuck-ups, but he feels like he's still playing the same game as the rest of X-COM. Same for the Templar- neat bugger, love the soulknife thing, and fun to use on missions, but he obeys basically the same laws as everyone else. The Reapers give no fucks. They're peerless scouts, invaluable spotters that let your snipers rain death with impunity, and saboteurs that can take out entire pods without ever being revealed. You only need one or two, but they're a helluva force multiplier for the way I play.
Got a bit lucky on this run, but I'm also just feeling good. Only thing I don't like is the campaign 'integration' of Shen's last gift. It's rather lackluster.