I have a 2003 X-Trail Di (note not a DcI, which I wouldn’t touch due to the unreliability of that engine). We’ve had it 3 1/2 years, or nearly 70K miles (now on 109K). It’s great. Reliable, gives 37mpg, is comfortable and is more than capable of cruising at 85mph should you feel the need. The downsides – interior cloth stains very easliy (go for leather) and the ventilation is crap. It used to tow a large caravan with ease. All in all it’s the best all-round vehicle I’ve ever owned, and I’ve had over 40…
If I was buying one today I would go for a 2.2di or a 2.5 petrol as these do about 33mpg so the benefit of the diesel is negated by the increased complexity of having a turbo etc. The 2 litre petrol is gutless and no more economical.