Im also curious to know how it was. I'm considering flying it with my kids without my husband on the flight. I'm not worried about safety per se, just a socially uncomfortable 10 hours.
I did JFK-TLV roundtrip with my family. I wouldn't recommend it for families, but mostly because of the stopover. It's almost 5 hours on the way there, which is rough with young kids (I have 3 boys 5 and under), even if you're in the lounge. Also, while the food on the way there was great, on the way back it's the same as regular Elal - ie plain rabanut. No activity packs for kids like you'll find on several other airlines. The IFE was good at least.
Other than that, I thought it was fine. I didn't really feel all that uneasy surrounded by arabs. I put on tallis and tefillin for shachris on JFK-AMM. Didn't feel particularly uncomfortable, though I did try to be as discreet as possible. There were at least 2 other fairly noticeable Jews on JFK-AMM, plus what I assume were non-frum Israelis. AMM-TLV had some other frum Israelis that must have been connecting from elsewhere. The whole way back I didn't really see any Jews, though I would say the crowd was more diverse overall (ie less arab/muslim feeling).
For some reason on the way there I thought you had to go through security an extra time to get to the Crown lounge, so we only hung out at the Petra lounge. On the way back I figured out where to enter the Crown lounge, which was much nicer and larger (and emptier). Of course you basically can't eat or drink anything. There's water and fruit (apples, oranges, and bananas). Everything else (including sodas and juices) has no hechsher, except maybe the booze.
On board service was just okay. We booked ABC and then A&C one row back. Both JFK-AMM and AMM-JFK we lucked out and had the second B seat empty (flights were actually pretty full). AMM-TLV was a much smaller plane and seemed completely full, while TLV-AMM was a 787 for some reason, and had maybe 50 people on it. Everyone sat wherever they wanted. We did have a significant delay AMM-JFK, and it wasn't communicated very well by RJ.
One other thing for families to keep in mind - I always thought gate checking strollers was a standard process. You give it to them right before you get on the plane, and get it back right when you get off the plane. On the way there, in AMM they initially told us it's being sent through to TLV underneath the plane. Before you go through security to get to the departure gates, there's a transit desk, and I was able to have the stroller brought up there. I then gate checked it again and received it at TLV just outside the gate as usual. On the way back, I gate checked in TLV, and didn't bother asking for it in AMM. Big mistake. At JFK we waited and waited for the strollers. They told us it would come on the oversize belt, but 5-10 minutes after the last bag came out on the regular carousel and still nothing. In the end it delayed us by at least 20 minutes after we'd already had all our luggage. I suspect that if I had asked for the stroller at AMM and re-gate checked it, it would've been brought up at the gate at TLV.