Hi Jenny,
You are certainly right to be cautious about spending money on advertising and marketing, it is key to getting a good return on your investment. Obviously I cannot directly answer your question, as we are Businessmagnet and it wouldn't be an unbiased opinion if we did. However we have 1000's of happy enhanced profiles on the directory, all of which have viewable results and statistics which can be accessed at the bottom of every advert. We also have video and written testimonials too.
As 28th June 2012 Businessmagnet received a full facelift, with every piece of code being re-written from scratch, there is a revised customer login system allowing far more functionality for free and paid listings, updated results and statistics and plenty more features.
The search system has also been updated to include a Google style predictive search, which recognises what you are typing, and instantly displays and updates results the more specific the keyword you enter.
Please visit Businessmagnet and login to your account to take control of your advert and see what free extras you can now add to your advert to maximise its potential.