I also joined a critique group. This is great because I was paired up with three other people. That right there is enough to beta read. Anyway we all read each others book and edit them. So my book is out to those people right now.
I found another professional editor who was willing to edit the first two chapters of my book for free. Of course I took him up on that since it is free. I got all of his feedback via email. I love getting critiques back. So far it has been a really positive response to the book.
I think with beta reading it is a lot less about editing little things. It's a lot about the big picture. Are there any plot holes. What are the characters like? I think that's important stuff! You can always go back in and comb through the grammar. The meat and potatoes is the story line.
I finished one book from my critique group today. It was a young adult suspense book. While I was beta reading, let me say this was my first experience with it, I found I liked it. It made me really read each sentence. I think a lot of times when we read for pleasure we skip and read the good parts. I have to say I enjoyed the book that I read.