I have tried a friend's unit and can say it definitely is a strong contender for "neutral." And unlike many IEMs, it has actual air presence, which is impressive for sub-$500.
Frankly, I still prefer my Blessing 2 since it images better with slightly better soundstage; in this regard, I'd say Crinacle's evaluation on the Azul's relatively mediocre imaging abilities is quite fair. Even so, Azul is a very worthy alternative if you prioritize greater coherency and arguably better tonality (though a little less bass quantity) - after all, said friend chose the Azul over the B2 after comparing the two. Plus, the Azul has no fit issues and great accessories.