Hi,
Have you heard the term "techno baffle" the information you have received may be helpful one day when you playing off plus 5 but until then I suggest the best thing to do when buying new irons is to try before you buy and always stick with a major brand as this way you can be reassured that millions of pounds has been spent on research and development etc, if you choose to go for a non major brand be prepared to lose many $$$'s when you resell or part exchange.
Hope this helps.