PLO 6-max convert to HUSNG PLO

I currently play/grind low limits cash PLO 6-max and a little HU. 

I'm interested in getting into HUSNG PLO. There seems to be limited information around on HUSNG for PLO so I wondered can anyone share their experience on: 

1: amount of action/traffic during non-peak and peak (European) times. 

2: softness of the field from $15s and up

3: expected ROI for a solid reg from $15s and up

4: best sites to play on aside from PokerStars - interms of traffic. 

5: worth learning/getting into over PLO HU/6-max cash in terms of learning curve and profibility. 

Any insight is appreciated! Thanks