Is roguelike deckbuilder sequel Slay the Spire 2 worth playing in early access?

Nearly nine years on from the release of the first game, Slay the Spire 2 has arrived in early access. The roguelike deckbuilder sequel has been an enormous smash hit, currently bringing in over 500,000 concurrent players at peak times.

But it's still got a long road ahead of it. According to developer Mega Crit, it could be in early access as long as two years while it adds "more gameplay content, a true ending, various game modes", and a lot more. So what should you expect from the current build...