As you can tell from the previous responses, the stealth 35mm models seem to be hit or miss. Several friends of mine have had them with the same sort of experiences.

If you get a good one, it is very good.
If you get a bad one, return it immediately for replacement or refund (if you can.)

From what i have heard, the company has had no issue with replacing them if you send them in.

As far as setting them up, it's just like hunting! Find where you think the deer might be and set up there