I've just sold my GL 350 Bluetec AMG Sport. If you can I'd got for the later 350's, they come as standard with AMG Line kit on it which is one thing that makes them look much better in my opinion. But not just that, they also came as standard with Airmatic suspension which makes the ride a lot better than the standard setup.
I've owned mine since new for the last three years, and sold it last week
It has been a fantastic car. Never lacking in power (my daily drive is a Golf R so very different experience). Very reliable.
If I were to give two negatives; yes that 7G gearbox can be a little hesitant at time, as was standard throttle response. But I used a DTUK pedal box on it and that seems to have things sorted out.
My friends had the same age (63 reg) ML and couldn't believe the difference when they saw the GL class. It is definitely E class vs S class, the whole interior may superficially look the same (as did the others in the range) but the choice of materials, how quiet the vehicle is, etc is a very different experience.
Realistic consumption, about 27mpg around town, 34mpg on the motorway. And we don't hang about.
It was really difficult to decide what we wanted instead. We decided to go two sizes down as my wife found it hard (and so did I) going in multi storey car parks and keep those lovely 21" clear around the high curbs. This vehicle is big, very big. As someone said earlier, the third row is suitable for adults! But we decided smaller is good, so next weekend I'm picking up our GLC43 AMG