We've not started yet (I'm finishing Coriolis: The Dying Ship first).
Our 5e DM has been the hardest sell so far - he said he thought it would be too dark for him, but I'm slowly winning him over.
Darker? Yes, but not too dark.
Apart from the amazing game art, a new game world, and familiar 5e rules, the biggest interest is in the Corruption mechanic.
I love this too. It makes magic more awesome, and costly.
(Mechanically, it reminds me a little of DCC where magic-users aren't necessarily constrained by spell slots.)
So once we finish The Dying Ship, my next up is Symbaroum.
I like to use published adventures (with ad-libs), and I plan on starting with the journey through the Titans and into the Copper Crown adventures.
I'll just wing it with monster and npc stats and see how that goes.
We'll be using last summer's Ruins sampler, and your London content too (so they don't have to just play a human or goblin), unless an official preview comes out in time.
One player really fancies playing a Revenant.
I'll definitely post back here with my experiences.