Ditto everything SCM has stated.
The only thing I found with NV was that sometimes when I bought it, it has freezer burn and it is expensive. I now make my own. Admittedly I hate doing it, but it only takes about 1-2 hours a month.
Cats go by smell for their food and commercial canned will smell differently than raw. As SCM stated, try them with some raw and see if they will eat it before spending the money on NV. If they don't, you can try adding tiny pieces of raw chicken mixed with their favourite canned to get them used to the smell and texture.
My cats eat half canned/half raw and because of the speed at which their food is digested, I too feed them 3 times a day.
Once they are on NV you may want to consider adding a bit of raw egg yolk (not whites) to their meal once or twice a week to give them a bit of extra B vitamins.
Cat maid to:
Jasper, male Ragdoll ?? (approx 10 yrs)
Rose semi feral, a cpietra rescue, female tabby (approx 7 yrs)
Sweet Pea RIP (2004?-2014)
Puddles RIP (1996-2014)
Snowball RIP (1991-2005)
In a cat's eye, all things belong to cats.-English Proverb
“While we are free to choose our actions, we are not free to choose the consequences of our actions.” Stephen R. Covey