After using the Hinomi X2 Pro chair for a few weeks I can verify that it really is a nice all day office chair and a definite upgrade from my leather Serta chair. Once I figured out and became familiar with all of the settings it is now easy to switch to different 'work' modes; Sitting up straight and a little forward for typing sessions, slightly angled back for keyboard/mouse/reading sessions, and reclining for training videos or boring teams meeting with no video :-)
The arm rests are both a Pro and a Con, they can be placed in any position to provide arm support no matter how you are sitting, but they also swivel out from under your arms if you move the wrong way. I feel like I am spending way too much time adjusting the arms to keep them where I need them to be so in that respect it is more of a distraction than an aid to concentration.
Even so, the X2 Pro is definitely one of the best chairs I have ever owned and I am very happy with my purchase.