I am about to get some of this but I would like to know if anybody has used it.
The Remington factory brass in 300 Ultra Mag brass had trouble with primer pockets opening up and that included there facory ammo too so I thought I might try something else.

if you do a search most likely you will find that for the most part that nickel after some resizing the "plating" flakes off and at times too the mouths generally split easier than brass - I quit using it.

yeah I don't like it either, the cases are plated inside and out, so upon resizing the soft brass flexes between the hard nickle coatings, it eventualy flakes, once that happens, the plating is hard enough to scratch your dies and your chamber.
I use it some, buy brass, load it shoot it, trash it, its good for what it was made for, it doesn't tarnish or corrode in bad conditions as bad as brass, thats why professional hunters like it, they can carry it for years and it still functions in the actions well.
RR