I do remember many parts of the books I read, and treasure them as parts of a good story. However, I cannot say that Feist's work has had an influence on my life. Ofcourse, it let me here, but that was more darkons doing.
I know that Terry Pratchett has really helped me improve my english, and as I read it just before I went to study in english, it was very helpfull. When I read feist, it was just another fantasy book. Good books always linger in the back of the mind however.