Just installed the "black hole" cover. Works as advertised.
I'm not likely to ever drop anything in there. In fact, I rarely set the brake, anyway. It's pretty flat around here. I just leave it in 1st.
Still, I could drop something in there. If you frequently carry passengers (especially kids), it could save you a lot of grief. Somebody drops a French fry down there, you'll be smelling it until you take it apart. Some guy in the UK dropped a key down there and had an interesting day because of that.
Like his AP holder, it's the best-engineered piece on the market. Other people sell a black hole filler, but you have to glue it in. This just locks in place, no muss no fuss. Looks factory. Got a key fob with it, too. Neat!