They are costy, but you don't have to replace them every 25,000,mi like most others (mine needed it's first replacement at about 138,000 mi ).
The universals aren't generally recomended. homegrown crimp connections have a habit of giving slightly different resistance readings to the ECU leading to poor running , milage and needing to be replaced sooner( that said, I wouldn't be splicing any wires to lenghthen).