Here are the results* from a 200-click solo ad I bought from Joni Leung. You can find more reviews in my solo ad directory.
Clicks bought: 200
Clicks received: 232
Optins: 114
Optin percentage: 49%
Sales: 1
Cost Per Optin: $.46
You can find Joni Leung at his website
*These are the results from my squeeze page and sales funnel. Your results may vary from mine.