I'm happy to buy early access games from developers I trust, provided it's $15 or less. I'll buy pretty much anything from Klei or Vlambeer. Don't Starve was in early access for at least a year, and it turned out great. Nuclear Throne is still in early access, but it's updated 2-3 times a month. When I bought it, half the game wasn't even playable. Now the game is fully playable. They just keep adding new features and replacing the remaining placeholder artwork. Definitely worth the money.