I've had my 2.4 JDTm Q4 for about 6,000 miles now, and I'm very very happy with it. Some points to note:
You'll need to make a decision quick. It won't sit on the forecourt for long at all. You'll probably need to put down a deposit over the phone.
There are 17 in the country in TI spec according to HowManyLeft, (if you believe it), however I'm not panicking about parts availability, as they will share most of the components with the V6 Q4, and there are many 2.4 Q4s on the continent (used as police cars IIRC)
It'll feel like an absolute tank compared to the 156. Very solid, very 'planted'. Arguably less 'sporty and chuckable'. Whether you like that or not is up to you.
It weighs about 1700 kgs dry, so the fuel consumption is pretty high (even on the motorway). You won't get the 42mpg it says in the add, even with the Mangos box. Mine is at about 35 mpg without remap. I'm not sure if the Mangos upgrade includes DPF removal and EGR blanking as per the Alfatune upgrade.
The Q4 system is extra weight in the dry, but is great in the wet. No fuss or drama. Have yet to experience my first winter, so don't know what it'll be like in snow. I suspect the biggest issue will be lack of ground clearanee in the snow.
Hope this helps