I do like the TCT boxes. They're very likely the future of automatics. The Guiletta I test drove had one and it was snappy and seamless.
Have to say though, the 5gtronic old school box in my C class is nice. If you put it in Sport mode changes are quick enough, but in Comfort you literally only notice them by the change in the engine revs. It has a tiptronic mode if you can be bothered. It could just do with 5th being a little longer though.
My friend who's taking delivery of a 12week old E-class on Saturday will have the new 9g box. He says on his test drive he couldn't notice the changes as it's all preselected, and only doing 1500rpm at 80 was amazing.