I tend to agree with an earlier poster, and would stay away from all sites & services which 'promise' you leads.
Most of my clients are aged 50+ and very few use the internet, so any web based service would be pretty much useless for me.
About 95 % of my work comes from recommendation, the other 5 % coming from advertising in the form of flyers (A5) given to people [not just put through a letter box] and a few colour flyers up in local shops. Also, the shops they're in also have a supply of flyers and are all customers anyway, so anyone interested gets a recommendation as well.
Flyers are cheap enough - I get them made up by a printer on eBay ~ less than £20 / 1000. Always carry some in my car
What I do do -which helps to build up a good reputation and helps a lot with getting active recommendations, is to give a discount as in :
Existing customer A gives their friend B a glowing recommendation about me. Customer B contacts me, mentions customer A and I get work. Next time I do work for Customer A they get a discount. I usually discount 4 hours labour and up to £10 materials, which equates to about £ 75 ....which is less than I'd pay for one insertion in the local rag.
Customer A very chuffed - build a stronger relationship, tells Customer B who then actively recommends me to others .....
Yes - £ 75 is a lot of money in some ways, but £ 75 is an insignificant cost to get a good, regular customer. It works for me anyway. Building a steady regular income from very good payers who don't give me any hassle whilst acting as my part-time sales people.