Natalie from Ohio said "I really liked the character of Scorpius Malfoy and seeing Harry, Ron and Hermione grown up. I think they did the magic on stage really well."
Audience member Julia, from Milan, added: "It was really cool. i wish they would do all seven books in the theatre
Although not an official reviews night, several papers have published their verdict on the first preview.
Tuesday night's preview marked the first time a Harry Potter story has been presented on stage.
Part two will get its first outing on Thursday night. The show doesn't have its official opening until 30 July. The play, written by Jack Thorne and directed by John Tiffany, is set 19 years after the seventh and final book in the series by JK Rowling. Picking up from where the Deathly Hallows epilogue left off, it portrays Harry, played by Jamie Parker, as an "over-worked" employee at the Ministry of Magic. His youngest son Albus (Sam Clemmett) has to deal with the "heavy burden" of the Potter family legacy. other characters include Hermione Granger (Noma Dumezweni), Ron Weasley (Paul Thornley), their daughter Rose (Cherrelle skeete), Ginny Potter (Poppy Miller), Draco Malfoy (Alex Price). Earlier, Rowling had tweeted a good luck message to Anthony Boyle, who plays Draco's son,scorpius.