They have started but at the moment they are operated by National 757. For crew training purposes it was operated on ALC and AGP over the last few days. I think on 05/05 they are deploying it permanently onto EWR service.
I flew on it to ALC on the 29th and aircraft is quiet and comfortable, good legroom and I was right at the back of the aircraft. USB charging points, no entertainment, 3 toilets on board. Apparently it will only be 4 crew as 198 passengers on board. On our journey crew were not very good. Not friendly or polite, from crew perspective it was very much Ryanair experience. Preordered meal was disgusting, delivered 1:30 hrs into the flight (2:20 flt time).
No OLCI but luckily flight quite empty so no queue. No priority boarding called (although sold)... I will not fly with them again.