Just to help with a few points raised in this topic, I’ve just traded a late 2017 RX450h F Sport for a new NX450hF Sport. The RX has been, and still is, an excellent car. Extremely comfy and plenty of torque but the wife has always found it a bit of a barge which it is, particularly when squeezing in to parking spaces etc.
We had an NX300 a few times as a courtesy car and no way would I have moved from the RX in to one of those, but the new NX is light and day different from the previous model. It does feel quite a bit smaller to me once inside, something which I no doubt will get used to, but other than that it was a delight to drive with quicker acceleration than the RX.
Yes there are big discounts to be had on a new RX if you take a car which is already in the network, which is what we did at the time of purchase back in 2017 to secure a decent discount.
Will that discount be nullified on trade in 3-4 years down the line, probably but we benefited from the current surge in demand for 2nd hand cars and hence pricing. By way of illustration, against the new NX450h which won’t be delivered until around June, our px value is guaranteed until the new car arrives and was £4K higher that we were offered in Feb 2020, representing 65% of initial purchase (not list) price. Happy with that along with the 3 years free servicing and £750 discount which we also secured, even allowing for residuals becoming more normalised in years to come.
As for running costs of the RX, it has been faultless since purchase and has returned an impressive 35.6mpg over that time, which is better than I was expecting.