I just got my '09 GTI, and LOVE it! I traded in my '06 Audi A3, which had the same engine, and many similar features, but the GTI feels so much sportier. The engine is great, and DSG is awesome. I still have to gently break it in, so look forward to the day I can really test the limits :)
DSG, engine, fuel economy, build quality.
hmm...haven't had it long enough, but more colors would be awesome.