I was worried when I got a Switch because I had only heard bad things about the grip, but turns out it was just the internet being overly negative again.
The grip is absolutely fine, and I have played 95% of my play time on the switch with it. I really don't like using dual loose joycons, never liked it in the Wii, and here its even worse because the joycons are too small and I have trouble pushing the trigger buttons. The grip doesn't give me any trouble at all. Of course it's not comparable to a regular bulky controller, but that's not the intention, it's just an option for those who don't want to buy a Pro Controller.
I'm going to buy a Pro eventually but only because I want a D-pad for 2D platformers, otherwise I would rock my grip forever.