Got my wiring done earlier today. I used 20 gauge solid core with wire taps on the wires coming from the stereo. On the steering wheel end, I could shove the wires in enough that they were pretty firmly in place. A tug would loosen them easily, but I taped things up so that the wires won't be moving around. Everything worked fine and overall it was a very straightforward install. Really makes you wonder why Subaru didn't offer the controls as a dealer-installed option at the very least!