Hi @Eddizle
I have flown Saudia in J this year in May/June.
Usually I only used to fly Y, and my first J experience ever was on Saudia. Thats why I would say it was good, as I have never experienced any other J product before. The fares on Saudia were very cheap, almost as cheap as booking Y on other airlines.
Well, from what I read and observe, the experience on Saudia J is not as great as other airlines, but still far better off than Y. I suppose by not expecting too much, you will not be disappointed.