Before i was using *A , and reached TK C+ only because of intercontinental flights with TK/LH. The benefits are ok , as long as you travel with TK, but you dont get as much as FB silvers
I switched to ST and FB , cause AF was cheaper and more convenient than AC, i was quite close from gold last year , i wil try gold for 2016 but i dont see the etra benefits once you are sit in the plane
The real thing that iam worried now is that i dont see any new improvments in the services/products of airlines , only downgrades and lower prices , despite the competition is getting thougher than before