Tell me about your good beta experiences. As an author or a beta ... What's your favorite part of the critique? Any good stories where the beta helped in the publishing process? Offered a suggestion that changed the whole narrative (in a good way)? What surprised you about the beta experience?
I've never had a beta myself, but I've offered on a couple of occasions to be a reader. I especially enjoyed beta-ing a YA novel. I read the entire manuscript at once and, after returning my comments, got immense thanks from the author because reading my comments had given her ideas to fix a couple plot holes she was worried about.