The HH NX is an excellent bushwalking tent in my opinion, but it is different in a number of ways to previous HH variants, and two of the differences in particular could be concerning for owners or prospective buyers.
First, MSR are no longer seam sealing the HH NX tent. Instead they say they are using precise stitching with water resistant thread, however they say that if you are going to use the tent in heavy rain that once off seam sealing may be required. Well, like any change there are always doubts. I haven't seam sealed the tent and it started raining this morning at about 7am so I pitched my HH NX to see how it went. It rained pretty steadily for about 6 hours and we've had over 25 mm of rain, then there was a break and we got a couple more hours of rain. I carefully opened one of the fly doors to check and there is not a drop of water inside the tent, so I won't be bothering to seam seal the seams. It looks like the precise stitching with water resistant thread does the job.
Second, the pole end grommets have been omitted from the new universal footprint meaning that the fly first pitch option is no longer possible - or is it? MSR really wants you to buy their fast and light option which is ostensibly a footprint with low walls but that's no use if you're out with your tent and want to pitch it in the rain. There is an easy fix that involves tying a small overhand loop knot in each of the universal footprint tie out guy lines at the end where it joins the footprint. The loop needs to be so small that pushing the pole end spigot through it is tight. You can then pitch the fly first, then from inside the fly clip the inner tent onto the poles and onto the pole end spigots.