I was wondering if there is anybody out there that have tried or are using the sub70 irons either the https://www.golfsub70.com/sub-70-639-cb-irons.html or the https://www.golfsub70.com/sub-70-739-iron.html. I am a 12 handicap and have been using Cobra Amp irons for the last 7 years. Am in the market for some new clubs. I also don't know if I should go with the 639s which are a game improvement iron or the 739 which is the "player iron" I am leaning towards the 639. Just looking for some feed back. Thanks