given the choice i would take my old manual 03 plate over the latest models. the TGX was a novelty when i got my hands on one of the first i had seen on the road but now i prefer the old ones
The latest boxes are better than the earlier ones. Driving an auto box needs a different technique to a manual:
When you approach a roundabout use the manual override to slow down from far enough away so the auto has reset by the time you get there (hold the gear selector down for 2 secs and it will change down to 10th); after that just use the brake. As you come up to the line at the roundabout, just give the accelerator a “blip” which will force it to change down into the right gear; then you can either stop or accelerate away. DO NOT floor the pedal when you do or it will be very slow; just be gentle and it will respond. Try hard not to come to a complete stop, but if you do, then wait for it to select 3rd or 4th before you try to pull away.
You may want to use the manual setting when heavy loaded on an undulating road. The computer can’t tell that you are nearly at the top or bottom of a hill and will keep making unwanted changes. I also change to manual when using the (pretty effective) exhaust brake; otherwise it keeps changing down a gear. In manual the little arrows on the screen show you how many gears up or down it will allow you to use.
Whenever you stop on an up slope — use the park brake. You need to feather the throttle to engage the clutch (yes it does have a dry plate clutch) before you let the brake off to pull away. If you are facing uphill holding it with the footbrake, you can’t do it quickly enough to stop a roll back.
At first you will think it keeps selecting the wrong gear. It will change into 12th at 40mph, even on an incline; it will happily drive at 30mph in 11th; Just assume that the engineers who designed it knew what they were doing, and let it make the decisions.
The key to having a safe, comfortable ride is to be gentle. Despite what you will hear, a good auto box (and the MAN is a good one) can keep up with its manual counterpart most of the time and, in my opinion, it brings a lot of the pleasure back into driving.
IT is true that they are better loaded than empty. I was driving a unit bobtail the other day in the rain. As I went down the slip road on to the M42 doing about 30mph, I hit the CC which was set at 55. Wheee!! It was a bloody good job that there was no one alongside me because I went sideways before I could get it back in line.
If all this sounds complicated then just try writing down the procedure for changing down from 5th to 4th on a range change manual box. It will soon become second nature.
What that man said… I drove a MAN auto at the weekend; the engine has loads of low-down torque (around 1,000rpm) which is great for pulling uphill, although my usual driving style is to ease off the gas for bends and let the engine brake the vehicle, although in this you need to use the retarder as it’ll as the torque enables the road speed to remain constant. I came down the Via Gellia and I was wondering why the thing appeared to be running away - It was only when I got to the bottom at Cromford that I realised I’d flicked it into manual override and it was in 10th gear! 
These transmissions don’t like being floored; a gentler approach is required and always remember to put the handbrake on for a hill start, lightly apply the throttle and take off the handbrake otherwise it’ll roll back.