I think the bike steers better with them. It's subjective, I can't tell you how. Maybe the thicker section under the clamp. After looking at the bars on my Grom, I still don't know what to use to replace them.
I swapped out my bars for a set from a Buell Lightning that I had around. Way better than the T-Rex arms I had with the original bars. Key removal is a little awkward, but I'll roll with it until a get a bar without the cross bar.