Ah, the Twist Loofah Sponge. I've actually had a couple of these for months, but I wanted to really decide what I thought before posting about it. Essentially, if you're familiar with loofahs and scrubby sponges you'll get the concept pretty quickly. I've never seen any other product that combines the two though.
I was able to give this a pretty difficult test - our stove seems to build up some serious crust. I scrub as hard as I can, even employing baking soda, and sometimes I can't get the crud off. This sponge actually did a better job than most "heavy duty scrubbers" on this sort of task. I also used a separate one to scrub my bathroom and it made quick work of any grime in there too.
My only real complaint is that I am not a big fan of loofahs in general because they don't actually absorb water well (does anyone know what I mea by this?) They don't soften and occasionally the way they don't bend makes them a bit clunky.
Anyway, of all the Twist sponges, this is my favorite.