I got my grips at the end of level 3, they are fantastic!
But I only got them because I would rip every single gym class, and now I hardly ever rip.
I can't say there is a lot of difference with the way I grip the bar though, so I would only get some if you're hands rip a lot. Hope this helps!
Oh, and use Reisport Grips, they are the best! You can buy them online, but also at competitions. Or ask your coach.