With regard to whether PairTrade Finder PRO works, you can demo it for 15 days for FREE to experience the results for yourself. After that, you will be harged for your subscription, though you have a further 30 days in which you may cancel and receive a refund, less a 10% administration fee.
The owners and managers of PairTrade Finder PRO use the program and find that it works and that yes one can make money with it, but you do have to spend time learning just like with everything else. You can see our unsolicited client testimonials on our main website at www.pairtradefinder.com.
As to what % you can earn from trading using it, that is a question that depends on risk-reward, entry and exit stretch levels, hedging levels, position sizing and many other factors. We are not a training company and we are not regulated to offer investment advice so we have to suggest that you explore other sources for an answer on that question.
PTF PRO Example USA Equities Pairs (www.pairtradefinder.com/autoload.html) are typically configured to generate a signal when a pair is 2.70 (a entry level which can be configured, refer to User Manual) standard deviations away from its mean, which is essentially the ratio price of the 2 stocks, then measures the last 100 day average of the ratio, then measures the day to day change in the ratio. When the current ratio moves at least 2.70 standard deviations away from the 100 day average (the mean) a signal is generated. When the ratio moves back within 1.00 standard deviations of the mean an exit signal is generated. You can change these entry and exit standard deviation from the mean parameters in PTF PRO. It may be helpful if you start paper trading PTF PRO on some US pairs, or our Example USA Equities Pairs so you get a feel for pair trading in general as you will have to answer some questions about the trading strategies.