I dunno, I just got mine prof. installed at a local reputable car audio shop, rate of $50/h for 1 1/2 hours of incredible work. Mic for BT mounted in a good location, ipod cable in glovebox, trim match. Such a clean install, even fixed up the mess from a previous install. All wires nicely tied and organized.. wont have an issue with interference. I've done installs myself, but wasn't so confident with messing around with the vss. At any rate, for $75 bucks I'm *VERY* glad I had it done.
just my 2 cents