....T_T has summed up and described the DSG perfectly.
No, it cannot possibly compare with all the skilled footwork etc on a high performance manual, but ultimately the joy is shifting into the optimum gear for your driving and DSG guarantees a faster-than-human shift and you have total control as to when. It's just a different method of achieving the same.
It's also the best of both worlds and very practical in cities and crawling traffic.
As far as modding is concerned, the best professionals take DSG into account and more and more is becoming available. ATB diff? Modified wishbones? The Mk5 GTI obviously won't keep up with a modern Porsche but it's great fun and one of the very best allrounders on offer. 5-door DSG is the way to go....Nearly 40,000 miles later and I'm still grinning and enjoying every moment I'm driving.