Of course you know they will either be too kind, or too critical. But this is what getting some eyeballs on your manuscript will do for you: identify typos; point out inconsistencies; clarify weak story lines, just for starters. By the questions they ask you may realize where you have more work to do.
My daughters just finished reading the latest draft of my first novel, working title, The Energy Collector. They had good suggestions on pacing, inconsistencies and incomplete story threads. And they caught stupid mistakes too. For some reason, when I want to type quick, I've been typing quit. What's that about? Is there a message there? Forget about it! I'm not going to quit. The trouble with Word is that it will notify you of misspellings, but not usage errors. Don't give an agent or publisher the least excuse to throw your beautiful manuscript down in disgust.