Thanks, that's useful extra information. I perhaps should have added in the quote that was giving me pause for thought, which is from the recent What Car review:
'It's not as impressive at motorway speeds, though – the NX jostles you around, almost as though you're sitting on a washing machine during a slow spin cycle. The experience isn’t too irritating, but the Q5 TFSIe is more settled at faster speeds.'
TBH I'm not sure which trim this comment refers to. It could be the standard suspension or, perhaps more likely, F-Sport suspension, but then was the mode set to comfort or sport settings (or whatever Lexus calls these)? Actually, now I come to look closer, the summary highlights one con as 'Choppy high-speed ride on F Sport versions' and the BMW X3 is singled out as offering a notably better driving experience. And it's interesting that while many of the review sections get 4 or (often) 5 star ratings, 'Ride & Comfort' is relegated to 3 star. i suppose, to an extent, the substantial extra weight of the PHEV is almost bound to cause extra problems for the suspension.
I'm not, just to be clear, seeking to knock the NX - in many ways it looks like an excellent car. But it would be good to hear any further comments on the ride & handling aspect of the 450. A test drive is obviously going to be important here, but OTOH there's often not a good opportunity to appraise such things in detail in a limited test drive period.