Ever replace straight wire speaker cable connector

I have a pair of straight wire serenade speaker cables, 10 feet in length that are terminated with Straight wire locking bananas on both ends. They do not get as tight as I would like them to be. I am thinking about changing them to WBT brand spades. I would like to know if anyone has ever switched to WBT spades and if you had good results. Or any change in sound for better or worse? Also what are your thoughts on hurting the resale value of the cables? I may just sell them and purchase a speaker cable that is already terminated with WBT connections, if it hurt the resale value of the cables down the road. I do enjoy the straight wire sound.