Well they are indeed nice, but these are the three problems I find.
First of all in smaller screens, like my laptop's they have to use two "lines" unlike my PC where they perfectly fit in a single line.
Many people simply don't use them, like me. I'm used to how the forum was, and getting to where I want the old way is actually easier for me.
Slower loading time. Well even though it may be minor, it still is a fact, especially in slow PCs.
I do not want them removed, as they are a pretty cool feature. I just want to be abled to hide them.