First off there is a big difference between a flyer and an ad. An inserted flyer will get results, an ad most of the time wont.
I guess I should ask if you intend to just send them out one time or if you plan to do it regularly. You cant send out a flyer one time and expect anything. I send them out EVERY month and have done so for years. It is almost all I do.
I have a $25,000 copy machine and the counter on it is now very near 1 million. My business has been built from the beginning on flyers inserted into a small local paper and town money savers in surrounding cities.
Mass produced flyers, repeats and referrals have provided me 99.9 percent of all my work.
It has worked very well for me, but I don't know how it will work for others. You can't just do it one time, you have to continue to do it on a regular basis and people will begin to know your flyer.
Jeremy if you would like more info let me know, I think it looks like I am the only one that does this.