I can't speak for the SMG, I got the 6spd. While the Xi model doesn't offer the SMG as an option, if it did ... I probably wouldn't have gone with it. That's just my personal preference. The website says "This enables short, rapid gear changes through all six gears via the steering wheel paddles or selector lever, without the use of a clutch. (Requires Sport Package.)" The clutch is what I'd miss ... to me ... that's the whole point. Good luck, I hope someone can offer you s a good opinion on the SMG, I am curious to read it.