You probably paid $225 extra for the ExpressLink Programmer and appropriate connecting wires (as you call them), as opposed for $278 for the (mini Pro/CS44-cables/Flexstrips).
However, by using the Sonic ExpressLink Programmer (instead of using a mini Pro or Hi Pro), I believe you are limiting your future programming capabilities. The mini Pro or Hi Pro is capable of programming almost all hearing aid models (legacy and current), except for some wireless only models like the Widex DREAM platform.
I’m no expert on this Sonic ExpressLink Programmer but I believe it will not have the same multi-manufacturer connection capabilities that you get with a mini Pro or a Hi Pro. Correct me if I am wrong.