Bought my Crossfire and one of the first things I read about on this forum was the SB. I must admit I was highly skeptical about this cable as I believed it was quite expensive for how simple it really was but I found it a little cheaper on Ebay (the one with the 3 settings) and because so many here swore by it I purchased it.
It was mind blowing to feel the difference with it!!! I love Mercedes but the fact that the response was not like this stock is embarrassing! This little gimmick does wonders and I love having it. I let people decide for themselves when they drive my car but simply setting it to stock and then to "racing mode" and haven't met one guy who didn't have a big smile on his face when feeling the difference.
Now, I got around purchasing the tune. Cable was shipped yesterday and I sent my ECU file to Eurocharged. Anxiously waiting to hear back from them so I can update the software and see for myself what a difference it makes!