I bought moto g2 in Nov. 2014.
Lag-no
Hang- once during update to lollipop 5.0.2.but its works best with lollipop.lollipop is firstly introduced by moto.I bought g2 at price of 13k, now it is available at 10k.no service centres network.
Camera- good
Sound- best with two speakers at front.
User interface- good
Two micro sim slot.
Problems detected- no
Rumours that Moto g3 are also in pipeline.
Compare other devices before buying, because there is new offerings every in gadget world.