This is a really nice lipstick. My tube was also gritty. I'll use this up but wouldn't repurchase.
The colour pay-off for this lipstick is fantastic. The shade of red is very intense but I think it would suit many different shades of skin (I am Mac NC 25). Unfortunately, the lipstick feels very gritty on application and it also can easily go on as a thick layer, so I feel I have to be careful in case I get it on everything (including smudging it all over my face after I've applied it). I don't know if that will actually happen - I did drink a hot coffee from a coffee cup with lid and the lipstick seemed to stay within my lips, although lipstick did transfer to the cup's lid.
When I apply the lipstick, the colour is very bold and intense with a lot of shine. I think this is a good look for night but a bit too much for me during the day. If I blot with tissue (lightly press a tissue against my lips once) the colour becomes subdued, mainly because it isn't so shiny. I only wore the lipstick for 2 hours before removing it but the colour stayed even and true, even through a cup of coffee.
While the grittiness is off-putting, I like the colour so much that I would purchase again. I did buy a lipstick for my mum but I won't give it to her now because I know she won't like the grittiness.