I saw it tonight. It's actually pretty good, though some parts of it come across as fairly narmy. At times it almost feels like two different films are playing at the same time and with the same cast, and you just keep cutting back and forth between them. There's also a fair bit of emotional whiplash because the abusive relationship bits feel much darker then the giant monster bits, so when the film starts mixing them, it doesn't really work quite the way it's probably intended to.
And, no, there is no monster/monster puppeteer sex. I do think kinda wierd that the dancing monster doesn't get more in-universe reaction then it does.
So yeah, worth a watch, but it doesn't gel as well as it probably thinks it does.