I have a fondness for MSR products and have a lot of them including my Mutha Hubba 3 person, 3 season tent.  And it is a great tent - durable, easy to set up, great in wind and rain and fairly light weight.  However, mine is not the NX, which is a very different tent.  Everything I hear about the NX, though, is positive except that there are not enough places to stake it and some questions about durability. 
That being said, there are so many quality tents to choose from these days.  Two that keep showing up on all the "best of" lists are the Hilleberg Anjan 3 and the Big Agnes Copper Spur UL3.  If I had the money I'd choose the Hilleberg for quality of construction and design - but they are pricey.  The Big Agnes comes in at a more reasonable price and has a very good reputation.  Google "Best 3 person tents 2016" and you can see what others are saying.