Only tried Lazul so far, neat when she summons 1/1 convincing infiltrators, so try to keep that in your deck when possible. Almost every treasure pool has a c'thun package so consider that if you get 2x battlecry.
General stuff: You can get the same treasure but 2 double battlecry does nothing. I just didn't like the other treasures offered. (hp for spells, etc)
Saw one treasure pool in 8 fights be a empty treasure pool so at least every once inawhile you can pick that. No Bob's, but it's timed so that's ok.
Did a run as Lazul. I gave my minions rush with deathrattles triggering twice. I then made sure to add any good package with quality deathrattle minions and added enemy minions to my deck that fit the theme well. Breezed through it.
Lazul with Stargazing - easiest dungeon run of my life. Took 30 minutes.
Two 1/1's for 0 mana with busted deathrattles every turn. Getting Sylvanas Windrunner on average every two turns is gg. I didn't really even care what I drafted, just managed to get second Sylvanas and some removal. Mid-draft I got Zephrys Lamp, which got me turn 5 Bloodlust lethal on 3 bosses.
Y'all are missing out. Lazul has a bucket that gives you the mirror treasure (Choose a minion. Summon a copy and add it to your dungeon deck.) Use that on the BFF minion. Get 20 of them (game won't let you have more of them at the start, but extras can be added in a run) and go to town. It's also useful as an OTK item, since you'll play the doggo, then copy it, and slam their face for 40 damage.
Just now realizing the "Lasts FOREVER" part at the end of doggo.... Used Lazul to create a bunch of doggos, turn 1 of Toggwaggle I have 12/12 charge doggo... Beating the bosses in order, Dr. Boom and Lazul were pretty easy.. Deathrattle Lazul to steal the horseman's head and kill him with it via Sylvanas